Abstract
Alopecia areata (AA) is an autoimmune disease that has an underlying immuno-inflammatory pathogenesis and is characterized by nonscarring hair loss ranging from small patches to complete scalp (alopecia totalis [AT]), face, and body hair loss (alopecia universalis [AU]). Studies describing the epidemiology of AA, especially measuring the occurrence of AA within the general population, are scarce. This was a historical population-based cohort study in Denmark that estimated incidence rate (IR) and prevalence of hospital-treated AA among persons 12 years or older.
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