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Recent advances in atopic dermatitis (AD) present the condition as a heterogenous disease of distinct endotypes across ethnic groups. AD in people with skin of colour may appear psoriasiform, lichenoid, scaly, or papular, with a violaceous colour and there is a higher prevalence of post-inflammatory dyspigmentation compared to affected individuals of Caucasian ethnicity. These differences in clinical presentation may limit the use of AD assessment tools in people with skin of colour, leading to potential for misdiagnosis and underestimation of severity, particularly in relation to assessment of erythema. Recent targeted therapies for AD have been studied in multiple ethnic groups, however ethnicity-based subgroup analysis is often not performed. Further research is required to understand whether treatment responses or safety may differ among ethnic groups.

Background Nonadherence to immune-modifying therapy is a complex behaviour which, before the COVID-19 pandemic, was shown to be associated with mental health disorders in people with immune-mediated diseases. The COVID-19 pandemic has led to a rise in the global prevalence of anxiety and depression, and limited data exist on the association between mental health and nonadherence to immune-modifying therapy during the pandemic. Objectives To assess the extent of and reasons underlying nonadherence to systemic immune-modifying therapy during the COVID-19 pandemic in individuals with psoriasis, and the association between mental health and nonadherence. Methods Online self-report surveys (PsoProtectMe), including validated screens for anxiety and depression, were completed globally during the first year of the pandemic. We assessed the association between anxiety or depression and nonadherence to systemic immune-modifying therapy using binomial logistic regression, adjusting for potential cofounders (age, sex, ethnicity, comorbidity) and country of residence. Results Of 3980 participants from 77 countries, 1611 (40.5%) were prescribed a systemic immune-modifying therapy. Of these, 408 (25.3%) reported nonadherence during the pandemic, most commonly due to concerns about their immunity. In the unadjusted model, a positive anxiety screen was associated with nonadherence to systemic immune-modifying therapy [odds ratio (OR) 1.37, 95% confidence interval (CI) 1.07–1.76]. Specifically, anxiety was associated with nonadherence to targeted therapy (OR 1.41, 95% CI 1.01–1.96) but not standard systemic therapy (OR 1.16, 95% CI 0.81–1.67). In the adjusted model, although the directions of the effects remained, anxiety was not significantly associated with nonadherence to overall systemic (OR 1.20, 95% CI 0.92–1.56) or targeted (OR 1.33, 95% CI 0.94–1.89) immune-modifying therapy. A positive depression screen was not strongly associated with nonadherence to systemic immune-modifying therapy in the unadjusted (OR 1.22, 95% CI 0.94–1.57) or adjusted models (OR 1.14, 95% CI 0.87–1.49). Conclusions These data indicate substantial nonadherence to immune-modifying therapy in people with psoriasis during the pandemic, with attenuation of the association with mental health after adjusting for confounders. Future research in larger populations should further explore pandemic-specific drivers of treatment nonadherence. Clear communication of the reassuring findings from population-based research regarding immune-modifying therapy-associated adverse COVID-19 risks to people with psoriasis is essential, to optimize adherence and disease outcomes.

Atopic dermatitis (AD) is a global condition that has a rising prevalence in developing countries such as those within South-east Asia and Latin America. Recent research represents the condition as a heterogeneous disease of distinct endotypes among different ethnic groups. Variation between ethnic groups in physiological measures such as transepidermal water loss, ceramide/+, skin sensitivity, alongside pathological barrier and immune system dysfunction processes, may ultimately lead to the distinct phenotypes seen clinically. AD in patients of White ethnicities is typified by filaggrin dysfunction, more T helper (Th)1 and less Th17 involvement, with less epidermal thickness compared with patients of Black or Asian ethnicities. AD in patients of Black ethnic groups is Th2/Th22-skewed, with robust IgE expression, and less Th1 and Th17 involvement than patients of Asian or White ethnicities. AD across South Asian and East Asian populations is characterized by Th17/Th22 upregulation. Differences also exist in how AD psychosocially has an impact on individuals of different ethnic groups.