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Atopic dermatitis

Atopic dermatitis (AD), also known as atopic eczema, is a long-term type of inflammation of the skin (dermatitis).[2] It results in itchy, red, swollen, and cracked skin.[2] Clear fluid may come from the affected areas, which can thicken over time.[2] AD may also simply be called eczema, a term that generally refers to a larger group of skin conditions.[2][5]

Atopic dermatitis
Other namesAtopic eczema, infantile eczema, prurigo Besnier, allergic eczema, neurodermatitis[1]
Atopic dermatitis of the inside crease of the elbow
SpecialtyDermatology, Clinical Immunology and Allergy
SymptomsItchy, red, swollen, cracked skin[2]
ComplicationsSkin infections, hay fever, asthma[2]
Usual onsetChildhood[2][3]
CausesUnknown[2][3]
Risk factorsFamily history, living in a city, dry climate[2]
Diagnostic methodBased on symptoms after ruling out other possible causes[2][3]
Differential diagnosisContact dermatitis, psoriasis, seborrheic dermatitis[3]
TreatmentAvoiding things that worsen the condition, daily bathing followed by moisturising cream, steroid creams for flares[3] Humidifier
Frequency~20% at some time[2][4]

Atopic dermatitis affects about 20% of people at some point in their lives.[2][4] It is more common in younger children.[3] Females are slightly more affected than males.[6] Many people outgrow the condition.[3]

While the condition may occur at any age, it typically starts in childhood, with changing severity over the years.[2][3] In children under one year of age, the face and limbs and much of the body may be affected.[3] As children get older, the areas on the insides of the knees and folds of the elbows and around the neck are most commonly affected.[3] In adults, the hands and feet are commonly affected.[3] Scratching the affected areas worsens the eczema and increases the risk of skin infections.[2] Many people with atopic dermatitis develop hay fever or asthma.[2]

The cause is unknown but believed to involve genetics, immune system dysfunction, environmental exposures, and difficulties with the permeability of the skin.[2][3] If one identical twin is affected, the other has an 85% chance of having the condition.[7] Those who live in cities and dry climates are more commonly affected.[2] Exposure to certain chemicals or frequent hand washing makes symptoms worse.[2] While emotional stress may make the symptoms worse, it is not a cause.[2] The disorder is not contagious.[2] A diagnosis is typically based on the signs, symptoms and family history.[3]

Treatment involves avoiding things that make the condition worse, enhancing the skin barrier through skin care and treating the underlying skin inflammation. Moisturising creams are used to make the skin less dry and prevent AD flare-ups. Anti-inflammatory corticosteroid creams are used to control flares-ups.[3] Creams based on calcineurin inhibitors (tacrolimus or pimecrolimus) may also be used to control flares if other measures are not effective.[2][8] Certain antihistamine pills might help with itchiness.[3] Things that commonly make it worse include house dust mite, stress and seasonal factors.[9] Phototherapy may be useful in some people.[2] Antibiotics (either by mouth or topically) are usually not helpful unless there is secondary bacterial infection or the person is unwell.[10] Dietary exclusion does not benefit most people and it is only needed if food allergies are suspected.[11] More severe AD cases may need systemic medicines such as cyclosporin, methotrexate, dupilumab or baricitinib.

Other names of the condition include "infantile eczema", "flexural eczema", "prurigo Besnier", "allergic eczema", and "neurodermatitis".[1]

Signs and symptoms edit

 
Child with atopic dermatitis

Symptoms refer to the sensations that people with AD feel, whereas signs refers to a description of the visible changes that result from AD.

 
The pattern of atopic eczema varies with age.

The main symptom of AD is itching which can be intense. Some people experience burning or soreness or pain.[2]

People with AD often have a generally dry skin that can look greyish in people with darker skin tones of colour. Areas of AD are not well defined, and they are typically inflamed (red in a light coloured skin or purple or dark brown in people with dark skin of colour).[12] Surface changes include:

  • scaling cracking (fissures)
  • swelling (oedema)
  • scratch marks (excoriation)
  • bumpiness (papulation)
  • oozing of clear fluid
  • thickening of the skin (lichenification) where the AD has been present for a long time.[2]

Eczema often starts on the cheeks and outer limbs and body in infants and frequently settles in the folds of the skin such as behind the knees, folds of the elbows, around the neck, wrists and under the buttock folds as the child grows.[13] Any part of the body can be affected by AD.[14]

AD commonly affects the eyelids, where an extra prominent crease can form under the eyelid due to skin swelling known as Dennie-Morgan infraorbital folds.[15] Cracks can form under the ears which can be painful (infra-auricular fissure).[16][15]

The inflammation from AD often leaves "footprints" known as postinflammatory pigmentation that can be lighter than the normal skin or darker. These marks are not scars and eventually go back to normal over a period of months providing the underlying AD is treated effectively.[17]

People with AD often have dry and scaly skin that spans the entire body, except perhaps the diaper area, and intensely itchy red, splotchy, raised lesions to form in the bends of the arms or legs, face, and neck.[18][19][20][21][22]

Causes edit

The cause of AD is not known, although some evidence indicates environmental, immunologic, and potential genetic factors.[23]

Pollution edit

Since 1970, the rates of atopic dermatitis in the US and UK have increased 3-6 fold.[24] Even today, people who migrate from developing nations before the age of 4 years to industrialized nations experience a dramatic rise in the risk of atopic dermatitis and have an additional risk when living in urbanized areas of the industrial nation.[25] Recent work has shed light on these and other data strongly suggesting that early life industrial exposures may cause atopic dermatitis.[24][26] Chemicals such as (di)isocyanates and xylene prevent the skin bacteria from producing ceramide-sphingolipid family lipids.[24][26] Early life deficiency in these lipids predictive which children will go on to develop atopic dermatitis.[27][28][29][30] These chemicals also directly activate an itch receptor in the skin known as TRPA1.[31] The industrial manufacturing and use of both xylene and diisocyanates greatly increased starting in 1970, which greatly expanded the average exposure to these substances. For example, these chemicals are components of several exposures known to increase the risk of atopic dermatitis or worsen symptoms including: wildfires, automobile exhaust, wallpaper adhesives, paints, non-latex foam furniture, cigarette smoke, and are elements of fabrics like polyester, nylon, and spandex.[25][24][26]

Climate edit

Low humidity, and low temperature increase the prevalence and risk of flares in patients with atopic dermatitis.[32]

Genetics edit

Many people with AD have a family history or a personal history of atopy. Atopy is a term used to describe individuals who produce substantial amounts of IgE. Such individuals have an increased tendency to develop asthma, hay fever, eczema, urticaria and allergic rhinitis.[18][19] Up to 80% of people with atopic dermatitis have elevated total or allergen-specific IgE levels.[33]

About 30% of people with atopic dermatitis have mutations in the gene for the production of filaggrin (FLG), which increase the risk for early onset of atopic dermatitis and developing asthma.[34][35] However, expression of filaggrin protein or breakdown products offer no predictive utility in atopic dermatitis risk.[28]

Hygiene hypothesis edit

According to the hygiene hypothesis, early childhood exposure to certain microorganisms (such as gut flora and helminth parasites) protects against allergic diseases by contributing to the development of the immune system.[36] This exposure is limited in a modern "sanitary" environment, and the incorrectly developed immune system is prone to develop allergies to harmless substances.

Some support exists for this hypothesis with respect to AD.[37] Those exposed to dogs while growing up have a lower risk of atopic dermatitis.[38] Also, epidemiological studies support a protective role for helminths against AD.[39] Likewise, children with poor hygiene are at a lower risk for developing AD, as are children who drink unpasteurized milk.[39]

Allergens edit

In a small percentage of cases, atopic dermatitis is caused by sensitization to foods[40] such as milk, but there is growing consensus that food allergy most likely arises as a result of skin barrier dysfunction resulting from AD, rather than food allergy causing the skin problems.[41] Atopic dermatitis sometimes appears associated with coeliac disease and non-coeliac gluten sensitivity. Because a gluten-free diet (GFD) improves symptoms in these cases, gluten seems to be the cause of AD in these cases.[42][43] A diet high in fruits seems to have a protective effect against AD, whereas the opposite seems true for heavily processed foods.[39]

Exposure to allergens, either from food or the environment, can exacerbate existing atopic dermatitis.[44] Exposure to dust mites, for example, is believed to contribute to the risk of developing AD.[45]

Role of Staphylococcus aureus edit

Colonization of the skin by the bacterium S. aureus is extremely prevalent in those with atopic dermatitis.[46] Abnormalities in the skin barrier of persons with AD are exploited by S. aureus to trigger cytokine expression, thus aggravating the condition.[47] However, atopic dermatitis is non-communicable and therefore could not be directly caused by a highly infectious organism. Furthermore, there is insufficient evidence for the effectiveness of anti-staphylococcal treatments for treating S. aureus in infected or uninfected eczema.[48]

Hard water edit

The prevalence of atopic dermatitis in children may be linked to the level of calcium carbonate or "hardness" of household drinking water.[49][50] Living in areas with hard water may also play a part in the development of AD in early life. However, when AD is already established, using water softeners at home does not reduce the severity of the symptoms.[50]

Pathophysiology edit

Excessive type 2 inflammation underlies the pathophysiology of atopic dermatitis.[51][52]

Disruption of the epidermal barrier is thought to play an integral role in the pathogenesis of AD.[33] Disruptions of the epidermal barrier allows allergens to penetrate the epidermis to deeper layers of the skin. This leads to activation of epidermal inflammatory dendritic and innate lymphoid cells which subsequently attracts Th2 CD4+ helper T cells to the skin.[33] This dysregulated Th2 inflammatory response is thought to lead to the eczematous lesions.[33] The Th2 helper T cells become activated, leading to the release of inflammatory cytokines including IL-4, IL-13 and IL-31 which activate downstream Janus kinase (Jak) pathways. The active Jak pathways lead to inflammation and downstream activation of plasma cells and B lymphocytes which release antigen specific IgE contributing to further inflammation.[33] Other CD4+ helper T-cell pathways thought to be involved in atopic dermatitis inflammation include the Th1, Th17, and Th22 pathways.[33] Some specific CD4+ helper T-cell inflammatory pathways are more commonly activated in specific ethnic groups with AD (for example, the Th-2 and Th-17 pathways are commonly activated in Asian people) possibly explaining the differences in phenotypic presentation of atopic dermatitis in specific populations.[33]

Mutations in the filaggrin gene, FLG, also cause impairment in the skin barrier that contributes to the pathogenesis of AD.[33] Filaggrin is produced by epidermal skin cells (keratinocytes) in the horny layer of the epidermis. Filaggrin stimulates skin cells to release moisturizing factors and lipid matrix material, which cause adhesion of adjacent keratinocytes and contributes to the skin barrier.[33] A loss-of-function mutation of filaggrin causes loss of this lipid matrix and external moisturizing factors, subsequently leading to disruption of the skin barrier. The disrupted skin barrier leads to transdermal water loss (leading to the xerosis or dry skin commonly seen in AD) and antigen and allergen penetration of the epidermal layer.[33] Filaggrin mutations are also associated with a decrease in natural antimicrobial peptides found on the skin; subsequently leading to disruption of skin flora and bacterial overgrowth (commonly Staphylococcus aureus overgrowth or colonization).[33]

Atopic dermatitis is also associated with the release of pruritogens (molecules that stimulate pruritus or itching) in the skin.[33] Keratinocytes, mast cells, eosinophils and T-cells release pruritogens in the skin; leading to activation of Aδ fibers and Group C nerve fibers in the epidermis and dermis contributing to sensations of pruritus and pain.[33] The pruritogens include the Th2 cytokines IL-4, IL-13, IL-31, histamine, and various neuropeptides.[33] Mechanical stimulation from scratching lesions can also lead to the release of pruritogens contributing to the itch-scratch cycle whereby there is increased pruritus or itch after scratching a lesion.[33] Chronic scratching of lesions can cause thickening or lichenification of the skin or prurigo nodularis (generalized nodules that are severely itchy).[33]

Diagnosis edit

AD is typically diagnosed clinically, meaning it is based on signs and symptoms alone, without special testing.[53] Several different criteria developed for research have also been validated to aid in diagnosis.[54] Of these, the UK Diagnostic Criteria, based on the work of Hanifin and Rajka, has been the most widely validated.[54][55]

UK diagnostic criteria[55]
People must have itchy skin, or evidence of rubbing or scratching, plus three or more of:
Skin creases are involved - flexural dermatitis of fronts of ankles, antecubital fossae, popliteal fossae, skin around eyes, or neck, (or cheeks for children under 10)
History of asthma or allergic rhinitis (or family history of these conditions if patient is a child ≤4 years old)
Symptoms began before age 2 (can only be applied to patients ≥4 years old)
History of dry skin (within the past year)
Dermatitis is visible on flexural surfaces (patients ≥age 4) or on the cheeks, forehead, and extensor surfaces (patients<age 4)

Other diseases that must be excluded before making a diagnosis include contact dermatitis, psoriasis, and seborrheic dermatitis.[3]

Treatments edit

No cure for AD is known, although treatments may reduce the severity and frequency of flares.[18] The most commonly used topical treatments for AD are topical corticosteroids (to get control of flare-ups) and moisturisers (emollients) to help keep control.[56] Clinical trials often measure the efficacy of treatments with a severity scale such as the SCORAD index or the Eczema Area and Severity Index.[53][57]

Moisturisers edit

Daily basic care is intended to stabilize the barrier function of the skin to mitigate its sensitivity to irritation and penetration of allergens. Affected persons often report that improvement of skin hydration parallels with improvement in AD symptoms. Moisturisers (or emollients) can improve skin comfort and may reduce disease flares.[58] They can be used as leave-on treatments, bath additives or soap substitutes. There are many different products but the majority of leave-on treatments (least to most greasy) are lotions, creams, gels or ointments. None of the different types of moisturisers are more effective than the others so people need to choose one or more products that suit them, according to their age, body site effected, climate/season and personal preference.[59] Non-medicated prescription moisturisers may also be no more effective than over-the-counter moisturisers.[60]

There is no evidence that the additional use of emollient bath additives is beneficial.[61]

Medication edit

Topical edit

Corticosteroids applied directly on skin (topical) have proven effective in managing atopic dermatitis.[18][19][60][62] Newer (second generation) corticosteroids, such as fluticasone propionate and mometasone furoate, are more effective and safer than older ones. Strong and moderate corticosteroids work better than weaker ones. They are also generally safe when used in intermittent bursts to treat AD flare-ups. Applying once daily is as effective as twice or more daily application.[60][62]

In addition to topical corticosteroids, topical calcineurin inhibitors such as tacrolimus or pimecrolimus are also recommended as first-line therapies for managing atopic dermatitis.[60][63] Both tacrolimus and pimecrolimus are effective and safe to use in AD.[64][65] Crisaborole, an inhibitor of PDE-4, is also effective and safe as a topical treatment for mild-to-moderate AD.[66][67] Ruxolitinib, a Janus kinase inhibitor, has uncertain efficacy and safety.[60][63]

Systemic edit

Oral medications used for AD include systemic immunosuppressants such as ciclosporin, methotrexate, interferon gamma-1b, mycophenolate mofetil, and azathioprine.[18][68] Antidepressants and naltrexone may be used to control pruritus (itchiness).[69] Leukotriene inhibitors such as montelukast are of unclear benefit as of 2018.[70][71]

In 2017, the monoclonal antibody(mAb) dupilumab under the trade name Dupixent was approved to treat moderate-to-severe eczema.[72] In 2021, an additional monoclonal antibody, tralokinumab, was approved in the EU & UK with the trade name Adtralza then later in the US as Adbry for similarly severe cases.[73][74] As of 2023, another monoclonal antibody treatment, lebrikizumab, is awaiting approval in the US and Europe.[75][76] These monoclonal antibodies are highly effective for managing atopic dermatitis, but modestly increase the risk of conjunctivitis.[63][77]

Some JAK inhibitors such as abrocitinib, trade name Cibinqo,[78] and upadacitinib, trade name Rinvoq,[79] have been approved in the US for the treatment of moderate-to-severe eczema as of January 2022. These treatments are among the most effective systemic treatments, but have uncertain serious harms.[63][77]

Allergen immunotherapy may be effective in relieving symptoms of AD but it also comes with an increased risk of adverse events.[80] This treatment consists of a series of injections or drops under the tongue of a solution containing the allergen.[81]

Antibiotics, either by mouth or applied topically, are commonly used to target overgrowth of S. aureus in the skin of people with AD, but there is insufficient evidence for the effectiveness of anti-staphylococcal treatments for treating S. aureus in infected or uninfected eczema.[48]

Diet edit

The role of vitamin D on atopic dermatitis is not clear, but vitamin D supplementation may improve its symptoms.[82][83][84]

There is no clear benefit for pregnant mothers taking omega 3 long-chain polyunsaturated fatty acid (LCPUFA) in preventing the development of AD in their child.[85][86]

Several probiotics seem to have a positive effect, with a roughly 20% reduction in the rate of AD.[87][88][89] Probiotics containing multiple strains of bacteria seem to work the best.[90]

In people with celiac disease or nonceliac gluten sensitivity, a gluten-free diet improves their symptoms and prevents the occurrence of new outbreaks.[42][43]

Use of blood specific IgE or skin prick tests to guide dietary exclusions with the aim of improving disease severity or control is controversial. Clinicians vary in their use of these tests for this purpose and there are very limited evidence of any benefit.[91]

Lifestyle edit

Health professionals often recommend that people with AD bathe regularly in lukewarm baths, especially in salt water, to moisten their skin.[19][92] Dilute bleach baths may be helpful for people with moderate and severe eczema, but only for patients with Staphylococcus aureus.[93]

Avoiding woolen clothing or scratchy fibres is usually recommended for people with AD as they can trigger a flare.[94][95]

Self-management edit

Treatment regimens can be confusing and written action plans may support people to know what treatments to use where and when.[96]

A website supporting self-management has been shown to improve AD symptoms for parents, children, adolescents and young adults.[97][98]

Light edit

Phototherapic treatment involves exposure to broad- or narrow-band ultraviolet (UV) light. UV radiation exposure has been found to have a localized immunomodulatory effect on affected tissues and may be used to decrease the severity and frequency of flares.[99][100] Among the different types of phototherapies only narrowband (NB) ultraviolet B (UVB) exposure might help with the severity of AD and ease itching.[77][101] However, UV radiation has also been implicated in various types of skin cancer, and thus UV treatment is not without risk.[102] UV phototherapy is not indicated in young adults and children due to this risk of skin cancer with prolonged use or exposure.[33]

Alternative medicine edit

While several Chinese herbal medicines are intended for treating atopic eczema, no conclusive evidence shows that these treatments, taken by mouth or applied topically, reduce the severity of eczema in children or adults.[103]

Burden of Disease edit

Atopic Dermatitis (AD), commonly known as atopic eczema, is a chronic skin condition that significantly impairs the quality of life (QoL) of affected individuals. Although AD was previously considered primarily a childhood disease, it is now recognized as highly prevalent in adults, with an estimated adult prevalence of 3-5% globally.[104][105]

The impact of AD extends beyond physical symptoms, encompassing substantial humanistic and psychosocial effects. Its burden is significant, especially given the high indirect costs and psychological impacts on quality of life.[104][106]

According to the Global Burden of Disease study, AD is the skin disease with the highest disability-adjusted life-year (DALY) burden and ranks in the top 15 of all nonfatal diseases. In comparison with other dermatological conditions like psoriasis and urticaria, AD presents a significantly higher burden.[105]

While AD remains incurable, reducing its severity can significantly alleviate its burden. Understanding the extent of the burden of AD can aid in better resource allocation and prioritization of interventions, benefiting both patients and healthcare systems.[107]

Clinical and Economic Burden edit

AD is associated with various symptoms, including pruritis, depression, and anxiety. The prevalence of itching in AD patients ranges from 21% to 100%,[104] with the median severity of itch averaging around 6 on a 0-10 numerical rating scale.[104][108]

Economically, AD imposes a substantial burden, with the average direct cost per patient estimated at 4411 USD and the average indirect cost reaching 9068 USD annually.[104] These figures highlight the considerable financial impact of the disease on healthcare systems and patients.[109][110]

Humanistic Burden edit

AD significantly decreases the quality of life by affecting various aspects of patients' lives. The psychological impact, often resulting in conditions like depression and anxiety, is a major factor leading to decreased quality of life. Sleep disturbances, commonly reported in AD patients, further contribute to the humanistic burden, affecting daily productivity and concentration.[104][111]

The average utility value for the general AD population is approximately 0.779, with a gradual decrease in health-related quality of life (HRQoL) correlating with increasing severity of the disease.[104][112]

Productivity Loss edit

AD also has a marked impact on productivity. The total number of days lost annually due to these factors is about 68.8 days for the unstratified AD population, with presenteeism accounting for the majority of these days.[104] The impact on productivity varies significantly with the severity of AD, with more severe cases resulting in higher numbers of days lost.[104][113]

Burden of Disease in the Middle East and Africa edit

Atopic Dermatitis leads to the highest loss in disability-adjusted life years (DALYs) compared to other skin diseases in the Middle East and Africa.[114] Patients with AD in these regions lose approximately 0.19 quality-adjusted life years (QALYs) annually due to the disease. Egypt experiences the highest QALY loss and Kuwait the lowest. The estimated utility value for an average patient with AD ranges from 0.54 to 0.77.[114]

The average annual healthcare cost per patient varies is highest in the United Arab Emirates, estimated at US $3569, and lowest in Algeria at US $312. These costs are influenced by the economic status of each country and the cost of healthcare. Advanced treatments like targeted therapies and phototherapy are among the main cost drivers.[114]

Indirect costs, primarily due to productivity loss from absenteeism and presenteeism average about 67% in these countries. Indirect costs in Saudi Arabia are the highest in the area, estimated at US $364 million.[114] Factors like mental health impact, side effects of treatments, and other indirect costs such as personal care products are not fully accounted for in these estimates, suggesting that the actual burden might be even higher.[114]

Epidemiology edit

Since the beginning of the 20th century, many inflammatory skin disorders have become more common; AD is a classic example of such a disease. It now affects 15–30% of children and 2–10% of adults in developed countries, and in the United States has nearly tripled in the past 30–40 years.[19][115] Over 15 million American adults and children have AD.[116]

Society and culture edit

Conspiracy theories edit

A number of false and conspiratorial claims about AD have emerged on the internet and have been amplified by social media. These conspiracy theories include, among others, claims that AD is caused by 5G, formaldehyde in food, vaccines, and topical steroids. Various unproven theories also claim that vegan diets, apple cider vinegar, calendula, and witch hazel can cure AD and that air purifiers reduce the risk of developing AD.[117]

Research edit

Staphylococcus aureus may have a role in producing atopic dermatitis by colonizing on the skin.[118]

See also edit

References edit

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  2. ^ a b c d e f g h i j k l m n o p q r s t u v w x "Handout on Health: Atopic Dermatitis (A type of eczema)". National Institute of Arthritis and Musculoskeletal and Skin Diseases. May 2013. from the original on 30 May 2015. Retrieved 19 June 2015.
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External links edit

  • NIH Handout on Health: Atopic Dermatitis
  • Eczema Care Online. Toolkit for managing eczema.
  • International Society of Atopic Dermatitis.
  • Moisturiser Decision Aid . University of Bristol.

atopic, dermatitis, also, known, atopic, eczema, long, term, type, inflammation, skin, dermatitis, results, itchy, swollen, cracked, skin, clear, fluid, come, from, affected, areas, which, thicken, over, time, also, simply, called, eczema, term, that, generall. Atopic dermatitis AD also known as atopic eczema is a long term type of inflammation of the skin dermatitis 2 It results in itchy red swollen and cracked skin 2 Clear fluid may come from the affected areas which can thicken over time 2 AD may also simply be called eczema a term that generally refers to a larger group of skin conditions 2 5 Atopic dermatitisOther namesAtopic eczema infantile eczema prurigo Besnier allergic eczema neurodermatitis 1 Atopic dermatitis of the inside crease of the elbowSpecialtyDermatology Clinical Immunology and AllergySymptomsItchy red swollen cracked skin 2 ComplicationsSkin infections hay fever asthma 2 Usual onsetChildhood 2 3 CausesUnknown 2 3 Risk factorsFamily history living in a city dry climate 2 Diagnostic methodBased on symptoms after ruling out other possible causes 2 3 Differential diagnosisContact dermatitis psoriasis seborrheic dermatitis 3 TreatmentAvoiding things that worsen the condition daily bathing followed by moisturising cream steroid creams for flares 3 HumidifierFrequency 20 at some time 2 4 Atopic dermatitis affects about 20 of people at some point in their lives 2 4 It is more common in younger children 3 Females are slightly more affected than males 6 Many people outgrow the condition 3 While the condition may occur at any age it typically starts in childhood with changing severity over the years 2 3 In children under one year of age the face and limbs and much of the body may be affected 3 As children get older the areas on the insides of the knees and folds of the elbows and around the neck are most commonly affected 3 In adults the hands and feet are commonly affected 3 Scratching the affected areas worsens the eczema and increases the risk of skin infections 2 Many people with atopic dermatitis develop hay fever or asthma 2 The cause is unknown but believed to involve genetics immune system dysfunction environmental exposures and difficulties with the permeability of the skin 2 3 If one identical twin is affected the other has an 85 chance of having the condition 7 Those who live in cities and dry climates are more commonly affected 2 Exposure to certain chemicals or frequent hand washing makes symptoms worse 2 While emotional stress may make the symptoms worse it is not a cause 2 The disorder is not contagious 2 A diagnosis is typically based on the signs symptoms and family history 3 Treatment involves avoiding things that make the condition worse enhancing the skin barrier through skin care and treating the underlying skin inflammation Moisturising creams are used to make the skin less dry and prevent AD flare ups Anti inflammatory corticosteroid creams are used to control flares ups 3 Creams based on calcineurin inhibitors tacrolimus or pimecrolimus may also be used to control flares if other measures are not effective 2 8 Certain antihistamine pills might help with itchiness 3 Things that commonly make it worse include house dust mite stress and seasonal factors 9 Phototherapy may be useful in some people 2 Antibiotics either by mouth or topically are usually not helpful unless there is secondary bacterial infection or the person is unwell 10 Dietary exclusion does not benefit most people and it is only needed if food allergies are suspected 11 More severe AD cases may need systemic medicines such as cyclosporin methotrexate dupilumab or baricitinib Other names of the condition include infantile eczema flexural eczema prurigo Besnier allergic eczema and neurodermatitis 1 Contents 1 Signs and symptoms 2 Causes 2 1 Pollution 2 2 Climate 2 3 Genetics 2 4 Hygiene hypothesis 2 5 Allergens 2 6 Role of Staphylococcus aureus 2 7 Hard water 3 Pathophysiology 4 Diagnosis 5 Treatments 5 1 Moisturisers 5 2 Medication 5 2 1 Topical 5 2 2 Systemic 5 3 Diet 5 4 Lifestyle 5 5 Self management 5 6 Light 5 7 Alternative medicine 6 Burden of Disease 6 1 Clinical and Economic Burden 6 2 Humanistic Burden 6 3 Productivity Loss 6 4 Burden of Disease in the Middle East and Africa 7 Epidemiology 8 Society and culture 8 1 Conspiracy theories 9 Research 10 See also 11 References 12 External linksSigns and symptoms edit nbsp Child with atopic dermatitisSymptoms refer to the sensations that people with AD feel whereas signs refers to a description of the visible changes that result from AD nbsp The pattern of atopic eczema varies with age The main symptom of AD is itching which can be intense Some people experience burning or soreness or pain 2 People with AD often have a generally dry skin that can look greyish in people with darker skin tones of colour Areas of AD are not well defined and they are typically inflamed red in a light coloured skin or purple or dark brown in people with dark skin of colour 12 Surface changes include scaling cracking fissures swelling oedema scratch marks excoriation bumpiness papulation oozing of clear fluid thickening of the skin lichenification where the AD has been present for a long time 2 Eczema often starts on the cheeks and outer limbs and body in infants and frequently settles in the folds of the skin such as behind the knees folds of the elbows around the neck wrists and under the buttock folds as the child grows 13 Any part of the body can be affected by AD 14 AD commonly affects the eyelids where an extra prominent crease can form under the eyelid due to skin swelling known as Dennie Morgan infraorbital folds 15 Cracks can form under the ears which can be painful infra auricular fissure 16 15 The inflammation from AD often leaves footprints known as postinflammatory pigmentation that can be lighter than the normal skin or darker These marks are not scars and eventually go back to normal over a period of months providing the underlying AD is treated effectively 17 People with AD often have dry and scaly skin that spans the entire body except perhaps the diaper area and intensely itchy red splotchy raised lesions to form in the bends of the arms or legs face and neck 18 19 20 21 22 Causes editThe cause of AD is not known although some evidence indicates environmental immunologic and potential genetic factors 23 Pollution edit Since 1970 the rates of atopic dermatitis in the US and UK have increased 3 6 fold 24 Even today people who migrate from developing nations before the age of 4 years to industrialized nations experience a dramatic rise in the risk of atopic dermatitis and have an additional risk when living in urbanized areas of the industrial nation 25 Recent work has shed light on these and other data strongly suggesting that early life industrial exposures may cause atopic dermatitis 24 26 Chemicals such as di isocyanates and xylene prevent the skin bacteria from producing ceramide sphingolipid family lipids 24 26 Early life deficiency in these lipids predictive which children will go on to develop atopic dermatitis 27 28 29 30 These chemicals also directly activate an itch receptor in the skin known as TRPA1 31 The industrial manufacturing and use of both xylene and diisocyanates greatly increased starting in 1970 which greatly expanded the average exposure to these substances For example these chemicals are components of several exposures known to increase the risk of atopic dermatitis or worsen symptoms including wildfires automobile exhaust wallpaper adhesives paints non latex foam furniture cigarette smoke and are elements of fabrics like polyester nylon and spandex 25 24 26 Climate edit Low humidity and low temperature increase the prevalence and risk of flares in patients with atopic dermatitis 32 Genetics edit Many people with AD have a family history or a personal history of atopy Atopy is a term used to describe individuals who produce substantial amounts of IgE Such individuals have an increased tendency to develop asthma hay fever eczema urticaria and allergic rhinitis 18 19 Up to 80 of people with atopic dermatitis have elevated total or allergen specific IgE levels 33 About 30 of people with atopic dermatitis have mutations in the gene for the production of filaggrin FLG which increase the risk for early onset of atopic dermatitis and developing asthma 34 35 However expression of filaggrin protein or breakdown products offer no predictive utility in atopic dermatitis risk 28 Hygiene hypothesis edit According to the hygiene hypothesis early childhood exposure to certain microorganisms such as gut flora and helminth parasites protects against allergic diseases by contributing to the development of the immune system 36 This exposure is limited in a modern sanitary environment and the incorrectly developed immune system is prone to develop allergies to harmless substances Some support exists for this hypothesis with respect to AD 37 Those exposed to dogs while growing up have a lower risk of atopic dermatitis 38 Also epidemiological studies support a protective role for helminths against AD 39 Likewise children with poor hygiene are at a lower risk for developing AD as are children who drink unpasteurized milk 39 Allergens edit In a small percentage of cases atopic dermatitis is caused by sensitization to foods 40 such as milk but there is growing consensus that food allergy most likely arises as a result of skin barrier dysfunction resulting from AD rather than food allergy causing the skin problems 41 Atopic dermatitis sometimes appears associated with coeliac disease and non coeliac gluten sensitivity Because a gluten free diet GFD improves symptoms in these cases gluten seems to be the cause of AD in these cases 42 43 A diet high in fruits seems to have a protective effect against AD whereas the opposite seems true for heavily processed foods 39 Exposure to allergens either from food or the environment can exacerbate existing atopic dermatitis 44 Exposure to dust mites for example is believed to contribute to the risk of developing AD 45 Role of Staphylococcus aureus edit Colonization of the skin by the bacterium S aureus is extremely prevalent in those with atopic dermatitis 46 Abnormalities in the skin barrier of persons with AD are exploited by S aureus to trigger cytokine expression thus aggravating the condition 47 However atopic dermatitis is non communicable and therefore could not be directly caused by a highly infectious organism Furthermore there is insufficient evidence for the effectiveness of anti staphylococcal treatments for treating S aureus in infected or uninfected eczema 48 Hard water edit The prevalence of atopic dermatitis in children may be linked to the level of calcium carbonate or hardness of household drinking water 49 50 Living in areas with hard water may also play a part in the development of AD in early life However when AD is already established using water softeners at home does not reduce the severity of the symptoms 50 Pathophysiology editExcessive type 2 inflammation underlies the pathophysiology of atopic dermatitis 51 52 Disruption of the epidermal barrier is thought to play an integral role in the pathogenesis of AD 33 Disruptions of the epidermal barrier allows allergens to penetrate the epidermis to deeper layers of the skin This leads to activation of epidermal inflammatory dendritic and innate lymphoid cells which subsequently attracts Th2 CD4 helper T cells to the skin 33 This dysregulated Th2 inflammatory response is thought to lead to the eczematous lesions 33 The Th2 helper T cells become activated leading to the release of inflammatory cytokines including IL 4 IL 13 and IL 31 which activate downstream Janus kinase Jak pathways The active Jak pathways lead to inflammation and downstream activation of plasma cells and B lymphocytes which release antigen specific IgE contributing to further inflammation 33 Other CD4 helper T cell pathways thought to be involved in atopic dermatitis inflammation include the Th1 Th17 and Th22 pathways 33 Some specific CD4 helper T cell inflammatory pathways are more commonly activated in specific ethnic groups with AD for example the Th 2 and Th 17 pathways are commonly activated in Asian people possibly explaining the differences in phenotypic presentation of atopic dermatitis in specific populations 33 Mutations in the filaggrin gene FLG also cause impairment in the skin barrier that contributes to the pathogenesis of AD 33 Filaggrin is produced by epidermal skin cells keratinocytes in the horny layer of the epidermis Filaggrin stimulates skin cells to release moisturizing factors and lipid matrix material which cause adhesion of adjacent keratinocytes and contributes to the skin barrier 33 A loss of function mutation of filaggrin causes loss of this lipid matrix and external moisturizing factors subsequently leading to disruption of the skin barrier The disrupted skin barrier leads to transdermal water loss leading to the xerosis or dry skin commonly seen in AD and antigen and allergen penetration of the epidermal layer 33 Filaggrin mutations are also associated with a decrease in natural antimicrobial peptides found on the skin subsequently leading to disruption of skin flora and bacterial overgrowth commonly Staphylococcus aureus overgrowth or colonization 33 Atopic dermatitis is also associated with the release of pruritogens molecules that stimulate pruritus or itching in the skin 33 Keratinocytes mast cells eosinophils and T cells release pruritogens in the skin leading to activation of Ad fibers and Group C nerve fibers in the epidermis and dermis contributing to sensations of pruritus and pain 33 The pruritogens include the Th2 cytokines IL 4 IL 13 IL 31 histamine and various neuropeptides 33 Mechanical stimulation from scratching lesions can also lead to the release of pruritogens contributing to the itch scratch cycle whereby there is increased pruritus or itch after scratching a lesion 33 Chronic scratching of lesions can cause thickening or lichenification of the skin or prurigo nodularis generalized nodules that are severely itchy 33 Diagnosis editAD is typically diagnosed clinically meaning it is based on signs and symptoms alone without special testing 53 Several different criteria developed for research have also been validated to aid in diagnosis 54 Of these the UK Diagnostic Criteria based on the work of Hanifin and Rajka has been the most widely validated 54 55 UK diagnostic criteria 55 People must have itchy skin or evidence of rubbing or scratching plus three or more of Skin creases are involved flexural dermatitis of fronts of ankles antecubital fossae popliteal fossae skin around eyes or neck or cheeks for children under 10 History of asthma or allergic rhinitis or family history of these conditions if patient is a child 4 years old Symptoms began before age 2 can only be applied to patients 4 years old History of dry skin within the past year Dermatitis is visible on flexural surfaces patients age 4 or on the cheeks forehead and extensor surfaces patients lt age 4 Other diseases that must be excluded before making a diagnosis include contact dermatitis psoriasis and seborrheic dermatitis 3 Treatments editNo cure for AD is known although treatments may reduce the severity and frequency of flares 18 The most commonly used topical treatments for AD are topical corticosteroids to get control of flare ups and moisturisers emollients to help keep control 56 Clinical trials often measure the efficacy of treatments with a severity scale such as the SCORAD index or the Eczema Area and Severity Index 53 57 Moisturisers edit Daily basic care is intended to stabilize the barrier function of the skin to mitigate its sensitivity to irritation and penetration of allergens Affected persons often report that improvement of skin hydration parallels with improvement in AD symptoms Moisturisers or emollients can improve skin comfort and may reduce disease flares 58 They can be used as leave on treatments bath additives or soap substitutes There are many different products but the majority of leave on treatments least to most greasy are lotions creams gels or ointments None of the different types of moisturisers are more effective than the others so people need to choose one or more products that suit them according to their age body site effected climate season and personal preference 59 Non medicated prescription moisturisers may also be no more effective than over the counter moisturisers 60 There is no evidence that the additional use of emollient bath additives is beneficial 61 Medication edit Topical edit Corticosteroids applied directly on skin topical have proven effective in managing atopic dermatitis 18 19 60 62 Newer second generation corticosteroids such as fluticasone propionate and mometasone furoate are more effective and safer than older ones Strong and moderate corticosteroids work better than weaker ones They are also generally safe when used in intermittent bursts to treat AD flare ups Applying once daily is as effective as twice or more daily application 60 62 In addition to topical corticosteroids topical calcineurin inhibitors such as tacrolimus or pimecrolimus are also recommended as first line therapies for managing atopic dermatitis 60 63 Both tacrolimus and pimecrolimus are effective and safe to use in AD 64 65 Crisaborole an inhibitor of PDE 4 is also effective and safe as a topical treatment for mild to moderate AD 66 67 Ruxolitinib a Janus kinase inhibitor has uncertain efficacy and safety 60 63 Systemic edit Oral medications used for AD include systemic immunosuppressants such as ciclosporin methotrexate interferon gamma 1b mycophenolate mofetil and azathioprine 18 68 Antidepressants and naltrexone may be used to control pruritus itchiness 69 Leukotriene inhibitors such as montelukast are of unclear benefit as of 2018 70 71 In 2017 the monoclonal antibody mAb dupilumab under the trade name Dupixent was approved to treat moderate to severe eczema 72 In 2021 an additional monoclonal antibody tralokinumab was approved in the EU amp UK with the trade name Adtralza then later in the US as Adbry for similarly severe cases 73 74 As of 2023 another monoclonal antibody treatment lebrikizumab is awaiting approval in the US and Europe 75 76 These monoclonal antibodies are highly effective for managing atopic dermatitis but modestly increase the risk of conjunctivitis 63 77 Some JAK inhibitors such as abrocitinib trade name Cibinqo 78 and upadacitinib trade name Rinvoq 79 have been approved in the US for the treatment of moderate to severe eczema as of January 2022 These treatments are among the most effective systemic treatments but have uncertain serious harms 63 77 Allergen immunotherapy may be effective in relieving symptoms of AD but it also comes with an increased risk of adverse events 80 This treatment consists of a series of injections or drops under the tongue of a solution containing the allergen 81 Antibiotics either by mouth or applied topically are commonly used to target overgrowth of S aureus in the skin of people with AD but there is insufficient evidence for the effectiveness of anti staphylococcal treatments for treating S aureus in infected or uninfected eczema 48 Diet edit The role of vitamin D on atopic dermatitis is not clear but vitamin D supplementation may improve its symptoms 82 83 84 There is no clear benefit for pregnant mothers taking omega 3 long chain polyunsaturated fatty acid LCPUFA in preventing the development of AD in their child 85 86 Several probiotics seem to have a positive effect with a roughly 20 reduction in the rate of AD 87 88 89 Probiotics containing multiple strains of bacteria seem to work the best 90 In people with celiac disease or nonceliac gluten sensitivity a gluten free diet improves their symptoms and prevents the occurrence of new outbreaks 42 43 Use of blood specific IgE or skin prick tests to guide dietary exclusions with the aim of improving disease severity or control is controversial Clinicians vary in their use of these tests for this purpose and there are very limited evidence of any benefit 91 Lifestyle edit Health professionals often recommend that people with AD bathe regularly in lukewarm baths especially in salt water to moisten their skin 19 92 Dilute bleach baths may be helpful for people with moderate and severe eczema but only for patients with Staphylococcus aureus 93 Avoiding woolen clothing or scratchy fibres is usually recommended for people with AD as they can trigger a flare 94 95 Self management edit Treatment regimens can be confusing and written action plans may support people to know what treatments to use where and when 96 A website supporting self management has been shown to improve AD symptoms for parents children adolescents and young adults 97 98 Light edit Phototherapic treatment involves exposure to broad or narrow band ultraviolet UV light UV radiation exposure has been found to have a localized immunomodulatory effect on affected tissues and may be used to decrease the severity and frequency of flares 99 100 Among the different types of phototherapies only narrowband NB ultraviolet B UVB exposure might help with the severity of AD and ease itching 77 101 However UV radiation has also been implicated in various types of skin cancer and thus UV treatment is not without risk 102 UV phototherapy is not indicated in young adults and children due to this risk of skin cancer with prolonged use or exposure 33 Alternative medicine edit While several Chinese herbal medicines are intended for treating atopic eczema no conclusive evidence shows that these treatments taken by mouth or applied topically reduce the severity of eczema in children or adults 103 Burden of Disease editAtopic Dermatitis AD commonly known as atopic eczema is a chronic skin condition that significantly impairs the quality of life QoL of affected individuals Although AD was previously considered primarily a childhood disease it is now recognized as highly prevalent in adults with an estimated adult prevalence of 3 5 globally 104 105 The impact of AD extends beyond physical symptoms encompassing substantial humanistic and psychosocial effects Its burden is significant especially given the high indirect costs and psychological impacts on quality of life 104 106 According to the Global Burden of Disease study AD is the skin disease with the highest disability adjusted life year DALY burden and ranks in the top 15 of all nonfatal diseases In comparison with other dermatological conditions like psoriasis and urticaria AD presents a significantly higher burden 105 While AD remains incurable reducing its severity can significantly alleviate its burden Understanding the extent of the burden of AD can aid in better resource allocation and prioritization of interventions benefiting both patients and healthcare systems 107 Clinical and Economic Burden edit AD is associated with various symptoms including pruritis depression and anxiety The prevalence of itching in AD patients ranges from 21 to 100 104 with the median severity of itch averaging around 6 on a 0 10 numerical rating scale 104 108 Economically AD imposes a substantial burden with the average direct cost per patient estimated at 4411 USD and the average indirect cost reaching 9068 USD annually 104 These figures highlight the considerable financial impact of the disease on healthcare systems and patients 109 110 Humanistic Burden edit AD significantly decreases the quality of life by affecting various aspects of patients lives The psychological impact often resulting in conditions like depression and anxiety is a major factor leading to decreased quality of life Sleep disturbances commonly reported in AD patients further contribute to the humanistic burden affecting daily productivity and concentration 104 111 The average utility value for the general AD population is approximately 0 779 with a gradual decrease in health related quality of life HRQoL correlating with increasing severity of the disease 104 112 Productivity Loss edit AD also has a marked impact on productivity The total number of days lost annually due to these factors is about 68 8 days for the unstratified AD population with presenteeism accounting for the majority of these days 104 The impact on productivity varies significantly with the severity of AD with more severe cases resulting in higher numbers of days lost 104 113 Burden of Disease in the Middle East and Africa edit Atopic Dermatitis leads to the highest loss in disability adjusted life years DALYs compared to other skin diseases in the Middle East and Africa 114 Patients with AD in these regions lose approximately 0 19 quality adjusted life years QALYs annually due to the disease Egypt experiences the highest QALY loss and Kuwait the lowest The estimated utility value for an average patient with AD ranges from 0 54 to 0 77 114 The average annual healthcare cost per patient varies is highest in the United Arab Emirates estimated at US 3569 and lowest in Algeria at US 312 These costs are influenced by the economic status of each country and the cost of healthcare Advanced treatments like targeted therapies and phototherapy are among the main cost drivers 114 Indirect costs primarily due to productivity loss from absenteeism and presenteeism average about 67 in these countries Indirect costs in Saudi Arabia are the highest in the area estimated at US 364 million 114 Factors like mental health impact side effects of treatments and other indirect costs such as personal care products are not fully accounted for in these estimates suggesting that the actual burden might be even higher 114 Epidemiology editSince the beginning of the 20th century many inflammatory skin disorders have become more common AD is a classic example of such a disease It now affects 15 30 of children and 2 10 of adults in developed countries and in the United States has nearly tripled in the past 30 40 years 19 115 Over 15 million American adults and children have AD 116 Society and culture editConspiracy theories edit A number of false and conspiratorial claims about AD have emerged on the internet and have been amplified by social media These conspiracy theories include among others claims that AD is caused by 5G formaldehyde in food vaccines and topical steroids Various unproven theories also claim that vegan diets apple cider vinegar calendula and witch hazel can cure AD and that air purifiers reduce the risk of developing AD 117 Research editStaphylococcus aureus may have a role in producing atopic dermatitis by colonizing on the skin 118 See also editSweat allergyReferences edit a b Williams HC October 2000 Epidemiology of atopic dermatitis Clinical and Experimental Dermatology Cambridge University Press 25 7 522 529 doi 10 1046 j 1365 2230 2000 00698 x ISBN 9780521570756 PMID 11122223 S2CID 31546363 Archived from the original on 2015 06 19 a b c d e f g h i j k l m n o p q r s t u v w x Handout on Health Atopic Dermatitis A type of eczema National Institute of Arthritis and Musculoskeletal and Skin Diseases May 2013 Archived from 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Murphy M December 2021 Scratching the surface a review of online misinformation and conspiracy theories in atopic dermatitis Clinical and Experimental Dermatology 46 8 1545 1547 doi 10 1111 ced 14679 hdl 10468 11402 PMID 33864398 S2CID 233278383 Totte JE van der Feltz WT Hennekam M van Belkum A van Zuuren EJ Pasmans SG October 2016 Prevalence and odds of Staphylococcus aureus carriage in atopic dermatitis a systematic review and meta analysis The British Journal of Dermatology 175 4 687 695 doi 10 1111 bjd 14566 PMID 26994362 S2CID 23617550 External links edit nbsp Wikimedia Commons has media related to Atopic dermatitis NIH Handout on Health Atopic Dermatitis Eczema Care Online Toolkit for managing eczema International Society of Atopic Dermatitis Moisturiser Decision Aid University of Bristol Retrieved from https en wikipedia org w index php title Atopic dermatitis amp oldid 1197847497, wikipedia, wiki, book, books, library,

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