Pattern hair loss is the most common type of hair loss in both men and women. Scalp hair is typically affected in a characteristic distribution without other scalp or dermatologic fi ndings. Early recognition and treatment can help halt its progression to preserve as much hair as possible. Both pharmacologic and nonpharmacologic treatments have proven helpful.

Background Comorbidities are associated with higher health care costs, complex management, and poorer health outcomes. Identification and treatment of comorbid conditions in paediatric alopecia areata (AA) patients could provide an opportunity to improve health outcomes. Objectives To determine the prevalence of comorbidities among paediatric patients with AA using a large de-identified aggregated patient database. Methods This is a cross-sectional study using aggregated health record data through April 1, 2019. Patients ≤18 years of age, with alopecia areata (n = 3510) and without alopecia areata (n = 8 310 710) were identified. The primary outcome was the prevalence of comorbidities among AA patients. Results Of the 8 314 220 paediatric patients, 3510 (1570 males and 1940 females) had a diagnosis of alopecia areata. The most common comorbidities included atopic dermatitis (17.4% vs.

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