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The history and findings in this case are consistent with atopic dermatitis (AD).
AD is a chronic inflammatory skin condition that affects more than 200 million people worldwide, including as many as 30% of children and 10% of adults. Although it is more common in children (and may persist into adulthood), approximately 1 in 4 adults with AD have adult-onset disease.
The etiology of AD is complex and includes both genetic and environmental factors, including a weakened skin barrier, immune dysregulation, and abnormalities of the skin microbiome. AD is a member of the atopic triad (ie, AD, allergic rhinoconjunctivitis, and asthma), which may commence concurrently or in succession in what is referred to as the "atopic march."
The presentation of adult-onset AD may differ from that seen in children. For example, the most commonly reported body regions affected in adult-onset AD are the hands, eyelids, neck, and flexural surfaces of the upper limbs. In contrast, childhood-onset AD is less specific to body regions other than flexural areas. Xerosis is a prominent feature, and lichenification may be present. Some patients may have a rippled, brown macular ring around the neck, simulating the pigmentations seen in macular amyloid but due instead to postinflammatory melanin deposition. Pruritus is the most common and bothersome symptom associated with AD; patients may also experience anxiety, depression, and sleep disturbances.
Diminished quality of life, reduced productivity at work and school, and increased healthcare costs (hospitalizations, emergency visits, outpatient visits, and medications) have all been reported in patients with AD. Triggers for flare-ups vary among individuals; commonly reported triggers include physical or emotional stress, changes in temperature or humidity, sweating, allergens, and irritants.
AD is typically diagnosed clinically given the characteristic distribution of lesions in various age groups (infancy, childhood, and adult). Associated findings such as keratosis pilaris may help to facilitate the diagnosis. No biomarker for the diagnosis of AD has been found and laboratory testing is rarely necessary. However, a swab of infected skin may help to isolate a specific involved organism (eg, Staphylococcus or Streptococcus) and antibiotic sensitivity. Allergy and radioallergosorbent testing are not necessary to make the diagnosis. A swab for viral polymerase chain reaction may be beneficial to help identify superinfection with herpes simplex virus and identify a diagnosis of eczema herpeticum. Testing for serum IgE level can also be helpful for supporting the diagnosis of AD.
The management of AD includes trigger avoidance, daily skin care with application of emollients, anti-inflammatory therapy, and other complementary modalities. For mild or moderate AD, first-line treatment consists of topical anti-inflammatory ointments and creams, including topical corticosteroids, which are available in a broad range of potencies. Other topical medications include topical calcineurin inhibitors (tacrolimus and pimecrolimus for patients aged ≥ 2 years), which may be particularly appropriate when there is concern for adverse events secondary to corticosteroid use; topical phosphodiesterase 4 inhibitor (crisaborole ointment for patients aged ≥ 3 months); and topical Janus kinase inhibitor (ruxolitinib cream for patients aged ≥ 12 years).
For patients with moderate to severe AD, or for those who are refractory to topical medications, treatment may include biologic therapy (dupilumab and tralokinumab for patients aged ≥ 6 months and ≥ 18 years, respectively), oral Janus kinase inhibitors (upadacitinib and abrocitinib for patients ages ≥ 12 and ≥ 18 years, respectively), phototherapy (commonly narrow-band ultraviolet light type B treatment), and oral immunomodulators (including methotrexate, mycophenolate, and azathioprine). Combination therapy may be required for the long-term management of more severe AD.
William D. James, MD, Professor, Department of Dermatology, University of Pennsylvania, Philadelphia.
Disclosure: William D. James, MD, has disclosed the following relevant financial relationships:
Received income in an amount equal to or greater than $250 from: Elsevier.
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