International journal of dermatology
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Epidemiologic studies of alopecia areata (AA) are available from USA, Japan and European countries, but there is a paucity of literature on AA from Asian countries, especially from the Indian subcontinent. ⋯ Alopecia areata in North Indians showed a preponderance in men (M:F = 2:1) and the majority of persons with disease (88%) were below 40 years of age. Onset in childhood was more frequent in girls or women, but the incidence of severe alopecia was higher in boys or men with onset at an earlier age. Diseases associated with autoimmunity were seen in only 5% of patients. Atopy was found to be associated in 18% of patients, but its reported association with younger age of onset and severe alopecia was not confirmed. Presence of vitiligo in family members and onset before 20 years of age, especially in boys or men, were found to be risk factors for severe alopecia.