Abstract
Alopecia areata (AA) is an autoimmune disease of the hair and nails. Although genotype alters the risk, the etiology remains unclear. AA typically presents as one or more hairless patches; however, full loss of scalp hair occurs in about 15% of patients (Cranwell et al., 2019; Ikeda, 1965). The relative ease in semiobjectively quantifying the area of bald scalp has resulted in the Severity of Alopecia Tool (SALT) becoming the main measure of disease severity among physicians (Olsen et al, 2004).
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