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Allergy, Asthma & Clinical Immunology volume 14, Article number: 52 (2018)
Atopic dermatitis (AD) is a common, chronic skin disorder that can significantly impact the quality of life of affected individuals as well as their families. Although the pathogenesis of the disorder is not completely understood, it appears to result from the complex interplay between defects in skin barrier function, environmental and infectious agents, and immune dysregulation. There are no diagnostic tests for AD; therefore, the diagnosis is based on specific clinical criteria that take into account the patient’s history and clinical manifestations. Successful management of the disorder requires a multifaceted approach that involves education, optimal skin care practices, anti-inflammatory treatment with topical corticosteroids and/or topical calcineurin inhibitors, the management of pruritus, and the treatment of skin infections. Systemic immunosuppressive agents may also be used, but are generally reserved for severe flare-ups or more difficult-to-control disease. Topical corticosteroids are the first-line pharmacologic treatments for AD, and evidence suggests that these agents may also be beneficial for the prophylaxis of disease flare-ups. Although the prognosis for patients with AD is generally favourable, those patients with severe, widespread disease and concomitant atopic conditions, such as asthma and allergic rhinitis, are likely to experience poorer outcomes.
Atopic dermatitis (AD) is a chronic, highly pruritic (itchy) inflammatory skin disease, and is one of the most common skin disorders in children . The disorder results in significant morbidity and adversely affects quality of life . Not only are patients affected by the social stigma of a visible skin condition, but the intense itching characteristic of the disease often leads to skin trauma and significant sleep disturbances. In addition, management of the condition necessitates the frequent application of emollients (agents that soothe, moisturize and soften the skin) and topical medications, as well as physician visits. AD also poses a significant economic burden with an estimated annual cost in Canada of $1.4 billion .
Current evidence suggests that AD is a primary skin barrier defect that facilitates the development of other atopic conditions [4, 5]. In fact, AD is often the initial step in the “atopic march” (the sequential development of allergic disease manifestations during early childhood), which leads to asthma and/or allergic rhinitis in the majority of afflicted patients . Early AD may also be a causative factor in the development of food allergy .
Newer insights into AD suggest that both structural abnormalities of the skin and immune dysregulation play important roles in the pathophysiology of the disease. Therefore, optimal management of AD requires a multifaceted approach aimed at healing and protecting the skin barrier and addressing the complex immunopathogenesis of the disease [8, 9]. This article provides an overview of current literature related to the epidemiology, pathophysiology, diagnosis, and appropriate management of AD.
The pathogenesis of AD is not completely understood, however, the disorder appears to result from the complex interaction between defects in skin barrier function, immune dysregulation, and environmental and infectious agents [4, 5, 10]. Skin barrier abnormalities appear to be associated with mutations within or impaired expression of the filaggrin gene, which encodes a structural protein essential for skin barrier formation. The skin of individuals with AD has also been shown to be deficient in ceramides (lipid molecules) as well as antimicrobial peptides such as cathelicidins, which represent the first-line of defense against many infectious agents. These skin barrier abnormalities lead to transepidermal water loss (passage of water from inside the body through the epidermal layer of the skin to the surrounding atmosphere) and increased penetration of allergens and microbes into the skin. The infectious agent most often involved in AD is Staphylococcus aureus (S. aureus), which colonizes in approximately 90% of AD patients. Defective innate immune responses also appear to contribute to increased bacterial and viral infections in patients with AD. This interplay of factors leads to T cell responses in the skin (initially a predominantly T helper-2 [Th2] response and later a predominantly Th1 response) with resultant release of chemokines and proinflammatory cytokines (e.g., interleukin [IL]-4, IL-5 and tumour necrosis factor) that promote immunoglobulin E (IgE) production and systemic inflammatory responses, leading to pruritic inflammation of the skin.
The prevalence of AD has increased over the past 30 years. It is currently estimated that 10–20% of children and 1–3% of adults in developed countries are affected by the disorder . AD often starts in early infancy; approximately 45% of all cases begin within the first 6 months of life, 60% during the first year, and 85% before 5 years of age. In fact, many neonates destined to develop AD already have measurably increased transepidermal water loss on their second day of life , and this finding is strongly predictive of future food allergy . Fortunately, up to 70% of children with AD will go into clinical remission before adolescence [14, 15].
As mentioned earlier, children with AD are at high risk of developing food allergies, asthma and allergic rhinitis. Severe AD in infancy is a major risk factor for allergies to egg and peanut [7, 13, 16]. Results of a recent systematic review suggest that AD of increased severity and chronicity is particularly associated with food allergy, and that AD precedes the development of food allergy, suggesting a causal relationship . Evidence also suggests that of those who develop AD before the age of 2, 50% will develop asthma during subsequent years. Furthermore, those children with AD who develop asthma and allergic rhinitis are more likely to have severe disease .
There are no specific diagnostic tests for AD. Diagnosis of the disorder is based on specific criteria that take into account the patient’s history and clinical manifestations. Although various diagnostic criteria for AD have been proposed and validated, the application of many of these criteria is time consuming and often necessitates invasive testing. Table 1 provides simplified criteria proposed by Williams et al. that are easy to use, do not require invasive testing, and have been shown to have a high sensitivity and specificity for the diagnosis of AD [18,19,20,21]. Using these criteria, the diagnosis of AD requires the presence of an itchy skin condition (or parental/caregiver reports of scratching or rubbing in a child) plus three or more minor criteria, which vary depending on the patient’s age.
The clinical manifestations of AD vary with age (see Table 2). In infants, the scalp, face, neck, trunk and extensor (outer) surfaces of the extremities are generally affected, while the diaper area is usually spared. Children typically have involvement of the flexural surfaces of the extremities (i.e., fold/bend at the elbow and back of the knee), neck, wrists and ankles (see Fig. 1). In adolescence and adulthood, the flexural surfaces of the extremities, hands and feet are usually affected (see Fig. 2). Regardless of age, the itching associated with AD generally continues throughout the day and worsens at night, leading to sleep loss and substantial impairments in quality of life [2, 9].
It is sometimes difficult to differentiate AD from other skin conditions (e.g., seborrheic dermatitis, contact dermatitis, psoriasis, scabies); however, a family history of atopy and the distribution of lesions are helpful in making the diagnosis in many cases. Psoriasis, for example, usually affects the extensor rather than flexural surfaces, and often involves the fingernails, palms of the hands and soles of the feet. Seborrheic dermatitis typically involves the diaper area and scalp in infants, and the face in adults (e.g., sides of the nose, eyebrows, external ear canal). Furthermore, unlike AD, a family history of atopic disease is less common in patients with seborrheic or contact dermatitis. Scabies is generally associated with the presence of pustules on the palms, soles, genitalia and between the fingers. Other conditions that need to be considered in the differential diagnosis of AD are nutritional deficiencies, malignancies, and keratinization or immunodeficiency disorders that are associated with skin manifestations (see Table 3) .
The exact role of foods and aeroallergens in the pathogenesis and exacerbation of AD is controversial. Although most patients with AD demonstrate specific IgE antibodies to foods and/or aeroallergens on skin prick testing (SPT) and measurements of serum-specific IgE levels, their clinical significance remains unclear [17, 22]. In other words, while a positive SPT or serum-specific IgE test indicates sensitization to a particular allergen, this does not prove clinical hypersensitivity or causation.
In clinical studies, approximately 35% of children with moderate-to-severe AD have been found to have contributory food allergies . In general, the younger the patient and the more severe the AD, the more likely it is that specific food allergens may exacerbate the disease, however this is usually apparent in the clinical history. In contrast, food allergies appear to have little, if any, role in adult AD .
Random testing or screening to food allergens is not recommended as this may lead to unnecessary and inappropriate dietary restrictions in patients with AD. The positive predictive value of screening panels of food allergens in such cases is as low as 2%, and these screening panels are associated with significant health care utilization . Therefore, the decision to perform allergy testing to foods should be based on whether or not the patient’s history is highly suggestive of food allergies . Note that children with food-triggered AD are often instructed to begin strict elimination diets of the offending food. However, recent evidence suggests that these elimination diets should be prescribed with caution as they can inadvertently lead to loss of tolerance of foods and increase the risk of immediate, IgE-mediated food reactions .
Exposure to aeroallergens such as house dust mites, animal dander, pollen and moulds can exacerbate AD in some patients. In these cases, identification of sensitization by SPT may be useful. If sensitization is established, and the history suggests a causative role in worsening AD, then specific avoidance measures should be considered since removal of the allergen from the patient’s environment may improve the symptoms of AD. Atopy patch testing is still considered investigational in patients with AD because there are no standardized methods of application or test interpretation. However, patch tests may be useful for excluding a diagnosis of concurrent contact dermatitis .
Although there are currently no established primary prevention strategies for AD, recent trials have demonstrated the effectiveness of early, consistent application of emollients for infants at increased risk. This simple and cost-effective approach has resulted in a 30–50% reduction in the diagnosis of AD at 6 months [25,26,27]. By reducing AD, this intervention may have the potential to prevent food allergy.
The treatment of AD should be directed at restoring the skin barrier, which includes hydrating and repairing the skin, limiting itching, and decreasing inflammation when necessary. Therefore, the successful management of AD requires a multifaceted approach that involves patient and caregiver education, optimal skin care practices, anti-inflammatory treatment with topical corticosteroids (first-line) and/or topical calcineurin inhibitors (TCIs), and the treatment of skin infections [1, 8, 9, 17]. Systemic immunosuppressive agents may also be considered in severe cases that cannot be controlled with appropriate skin care and topical therapy. Although first-generation antihistamines are not routinely recommended for the management of AD due to their sedative and impairing side effects, short-term use of these agents may be helpful in those individuals experiencing severe flares of AD, particularly if these flares are associated with significant sleep disturbances.
A simplified, stepwise algorithm for the treatment of AD is provided in Fig. 3. Physicians should monitor patient progress and disease course regularly and evaluate the efficacy and tolerability of therapy. Follow-up evaluations should include an assessment of medication use (e.g., type, quantity applied, refills made, etc.), which allows the physician to gauge compliance and medication risks.
For optimal disease management, patients and/or their caregivers should be educated about the chronic nature of the disease, the need for continued adherence to proper skin care practices, and the appropriate use and application of topical therapies. Poor treatment outcomes are often related to poor adherence, especially to topical therapies, resulting from irrational fears about adverse effects and insufficient information . Time spent addressing these fears and educating patients and caregivers has been shown to have a positive effect on disease outcomes. Patients should also be provided with written instructions/information on appropriate medication use, skin care and flare management to reinforce learning.
Skin care principles
A key feature of AD management is appropriate daily skin care. Although the frequency of bathing is somewhat controversial, most experts suggest daily bathing . Bathing once or twice daily (depending on the severity of AD) in warm water for 10–15 min is recommended to help hydrate and cleanse the skin, assist in the debridement of infected skin, and improve the penetration of topical therapies. Moisturizing cleansers are recommended while highly fragranced soaps should be avoided as they may irritate the skin. After bathing, the patient’s skin should be patted dry with a towel (so it remains slightly wet) and moisturizers/emollients should be applied liberally to help prevent moisture loss and drying of the skin. Note that creams and ointments are more effective for moisturizing the skin than lotions. Experts recommend that patients purchase inexpensive brands of creams or ointments that are available in large containers/jars.
Topical corticosteroids are the first-line pharmacologic treatments for AD. These agents effectively control atopic flares through their anti-inflammatory, antiproliferative, and immunosuppressive actions. Numerous topical corticosteroids are available in Canada, ranging from low to high potency, and most of these agents are available in varying concentrations, preparations and doses (see Table 4). Topical corticosteroids are applied to the red, itchy or inflamed areas on the skin before the use of emollients. Some patients have inadvertently reversed the order, which significantly reduces the benefits of the topical corticosteroid.
There is limited clinical trial data to assist in choosing a corticosteroid. Ointment preparations are generally preferred over creams as they provide more uniform coverage and penetration. Also, the least potent preparation required to control AD (particularly in sensitive areas such as the face, neck, groin and underarms) should be utilized. Often, a low-potency preparation, such as hydrocortisone acetate 1% or equivalent, is used for the face.
When used appropriately, topical corticosteroids are extremely safe and effective. Possible local side effects of long-term topical corticosteroid use include striae (stretch marks), petechiae (small red/purple spots), telangiectasia (small, dilated blood vessels on the surface of the skin), skin thinning, atrophy and acne; however, these effects are uncommon with low or moderate potency preparations. Systemic side effects with topical corticosteroid use are rare, and are usually associated with higher-potency preparations being applied to a large body surface area.
Evidence also suggests that topical corticosteroids may be beneficial for the prophylaxis of AD flares. Studies have found that, after AD is stabilized, the addition of twice-weekly topical anti-inflammatories to maintenance treatment with emollients significantly reduces the risk of relapses in both pediatric and adult subjects .
Topical calcineurin inhibitors (TCIs)
TCIs are immunosuppressant agents that have also been shown to be safe and effective for the treatment of AD [9, 30, 31], as well as the prophylaxis of AD flares . Two TCIs—pimecrolimus (Elidel) and tacrolimus (Protopic)—are currently approved in Canada for the second-line, intermittent treatment of immunocompetent patients 2 years of age and older with moderate-to-severe AD. Given the high costs of these agents, they are generally reserved for patients with persistent disease and/or frequent flares that would require continuous topical corticosteroid treatment, or in patients severely affected in sensitive skin areas (e.g., around the eyes, face, neck and genitals) where systemic absorption and the risk of skin atrophy with topical corticosteroids are of particular concern.
The most common local adverse effects of TCIs are skin burning and irritation, which often improve with continued use. Although both Health Canada and the Food and Drug Administration (FDA) have recommended caution when prescribing TCIs due to rare reports of skin malignancy and lymphoma in patients using these agents, the Canadian Society of Allergy and Clinical Immunology (CSACI) released a position statement highlighting that, to date, there has been no published evidence showing that TCIs clearly predispose to malignancy. The CSACI concluded that TCIs are effective treatments for AD, and that the benefits of their use in the appropriately selected patient population outweighs the theoretical risk of increased malignancy .
Treatment of skin infections
The skin of patients with AD is often heavily colonized with S. aureus, even at uninvolved sites. Short-term topical and/or oral antibiotic therapy is recommended when an overt secondary bacterial infection is present. Appropriate systemic antibiotics are indicated for widespread secondary infection, and first- or second-generation cephalosporins or anti-staphylococcal penicillins for 7–10 days are usually effective in managing the infection. Because erythromycin-resistant organisms are common in patients with AD, macrolides are less useful alternatives .
Patients with AD are also prone to recurrent viral infections. Eczema herpeticum (a severe disseminated herpes infection that generally occurs at sites of skin damage; also known as Kaposi’s varicelliform eruption) is a serious risk in patients with widespread AD and may be easily misdiagnosed as a bacterial superinfection. Patients with this condition will require systemic antiviral treatment with acyclovir or other antiviral agents . Molluscum contagiosum (a common viral cutaneous infection caused by a poxvirus of the Molluscipox genus) is often seen in children with AD. Although the infection is usually self-limited, the lesions often resolve slowly and tend to spread in patients with AD . Severe, persistent molluscum contagiosum infection may require laser and/or antiviral therapy.
Diluted bleach baths are also recommended to help reduce the number of S. aureus skin infections, and the need for systemic antibiotics in patients with heavily colonized skin. Diluted bleach baths involve soaking the patient for approximately 10 min in a tub full of lukewarm water that is mixed with one-quarter to one-half cup (60–120 mL) of chlorine bleach (this concentration is similar to the amount of chlorine in a pool). The patient is then thoroughly rinsed with fresh water, and a moisturizer or emollient is applied immediately to prevent dehydration and dryness . Twice-weekly diluted bleach baths for a period of 3 months have been recommended by some authors .
Systemic immunosuppressive agents
Short-term treatment with systemic immunosuppressive agents, such as cyclosporine, azathioprine and methotrexate, has been shown to be effective in patients failing topical treatment and, therefore, these agents are often recommended for severe, refractory AD [8, 9]. However, it is important to note that discontinuation of cyclosporine often leads to rapid disease relapse. Also, patients treated with these immunosuppressive agents should be monitored for potential adverse effects, such as kidney or liver function impairment with cyclosporine, and myelosuppression with azathioprine. Therefore, referral to a specialist is warranted for AD patients who may be candidates for systemic immunosuppressive therapy.
Systemic corticosteroids have an unfavourable risk–benefit profile, and there is currently insufficient evidence supporting their use in AD. Therefore, these agents should be reserved for exceptional cases, and prolonged use should be avoided given their potential for serious adverse events .
Although first-generation antihistamines (e.g., hydroxyzine, diphenhydramine, chlorpheniramine) do not directly affect the itching associated with AD, the sedative effects of these agents have been found to help improve sleep in patients with AD [1, 17]. However, these agents have been found to reduce rapid eye movement (REM)-sleep, impair learning and reduce work efficiency  and, therefore, are not routinely recommended for patients with AD. They may be considered for the short-term adjuvant treatment of patients experiencing severe AD flare-ups who have difficulty sleeping or who scratch regularly while sleeping. Long-term and/or daytime use of first-generation antihistamines should be avoided given their sedative properties. Non-sedating second-generation antihistamines appear to provide modest benefit in AD patients with allergic triggers [1, 17] and, hence, a therapeutic trial of these agents may be considered in certain clinical situations.
Ultraviolet (UV) phototherapy may be beneficial for the treatment of AD in adults. However, the long-term toxicity of UV therapy is still unknown. Allergen-specific immunotherapy may also be effective in select patients with AD that is associated with aeroallergen sensitization (see Allergen-Specific Immunotherapy article in this supplement) [35,36,37].
Although some studies have found wet-wrap therapy (the application of wet bandages over AD lesions after applying emollients and/or topical corticosteroids) to be effective for the treatment of AD, others have questioned its effectiveness and emphasize the potential for associated complications such as local infections . A recent systematic review of trials comparing wet wrap therapy to conventional topical corticosteroid treatment in patients with AD found no good quality evidence to suggest that wet wraps are superior to conventional topical therapies .
A number of biologic agents targeting the immune pathways involved in AD are under investigation and may represent promising future therapies for the condition. Recently, dupilumab (a fully human monoclonal antibody directed against the alpha subunit of the interleukin-4 [IL-4] receptor) has been approved in Canada for the treatment of moderate-to-severe AD that is not adequately controlled with topical therapies or when these therapies are not advisable. Two phase 3 trials found dupilumab to significantly improve symptoms and quality of life in patients with AD compared to placebo .
The prognosis for patients with AD is generally favourable, with most children outgrowing the condition by early adolescence. However, patients with severe, widespread disease and concomitant atopic conditions, such as asthma and allergic rhinitis, are likely to experience poorer outcomes .
Atopic dermatitis is a common, chronic skin disease that starts early in life and can adversely impact the quality of life of patients and their caregivers. Optimal skin care practices and topical corticosteroids remain the cornerstone of therapy for the disease. TCIs have been shown to provide an effective, second-line alternative to topical corticosteroids in appropriate patients prone to frequent flare-ups. Systemic immunosuppressive agents may also be considered in severe cases that cannot be controlled with appropriate skin care and topical therapies. Allergy testing to foods and aeroallergens may be considered based on patient history and/or in patients exhibiting a poor response to optimal skin care practices and appropriate pharmacological therapy. A number of biologics, such as dupilumab, are being investigated in AD and may represent promising future options for management of this debilitating skin disorder.
T helper cell type-2
topical calcineurin inhibitors
skin prick testing
Canadian Society of Allergy and Clinical Immunology
Food and Drug Administration
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Authors’ contributions All authors wrote and/or edited sections of the manuscript. All authors read and approved the final manuscript.
This article is an update to the Atopic Dermatitis article that originally appeared in the supplement entitled, Practical Guide to Allergy and Immunology in Canada, which was published in Allergy, Asthma & Clinical Immunology in 2011 (available at: https://aacijournal.biomedcentral.com/articles/supplements/volume-7-supplement-1).
The authors would like to thank Julie Tasso for her editorial services and assistance in the preparation of this manuscript.
Dr. Sandeep Kapur is a Past President of the CSACI. He has received consulting fees and honoraria for continuing education sessions from Merck, Meda, Novartis, and Pediapharm.
Dr. Wade Watson is an associate editor of Allergy, Asthma & Clinical Immunology.
Dr. Stuart Carr is a Past President of the CSACI. He has received consulting fees and honoraria for continuing education sessions from Johnson & Johnson, Merck, Novartis, Pediapharm, Meda (Mylan), Tribute/Aralez, Nutricia, and GlaxoSmithKline.
None of the authors received any incentive or funding for the preparation or review of the manuscript.
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Publication of this supplement has been supported by AstraZeneca, Boehringer Ingelheim, CSL Behring Canada Inc., MEDA Pharmaceuticals Ltd., Merck Canada Inc., Pfizer Canada Inc., Shire Pharma Canada ULC, Stallergenes Greer Canada, Takeda Canada, Teva Canada Innovation, Aralez Tribute and Pediapharm.
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This article has been published as part of Allergy, Asthma & Clinical Immunology Volume 14 Supplement 2, 2018: Practical guide for allergy and immunology in Canada 2018. The full contents of the supplement are available online at https://aacijournal.biomedcentral.com/articles/supplements/volume-14-supplement-2.
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Kapur, S., Watson, W. & Carr, S. Atopic dermatitis. Allergy Asthma Clin Immunol 14, 52 (2018). https://doi.org/10.1186/s13223-018-0281-6
- Atopic dermatitis
- Diagnosis and management
- Skin care practices
- Topical corticosteroids
- Topical calcineurin inhibitors