Reappraisal of Ikeda's classification of alopecia areata: analysis of 356 cases from Chandigarh, India.

Three hundred and fifty six patients (234 males, 122 females) with alopecia areata were classified according to Ikeda's classification. The common type of alopecia areata was most frequently seen in 239 (67.13%) patients, followed by atopic in 60 (16.85%), prehypertensive in 48 (13.4%), and autoimmune/endocrine in 9 (2.52%) patients. Severe alopecia did not occur with a higher frequency in atopic or endocrine/autoimmune alopecia areata than in the common type (p > 0.05). Prehypertensive alopecia areata had the lowest frequency of severe alopecia in the present study. The odds for developing severe alopecia were highest (2.6) when onset was before 16 years of age, followed by female sex (2.12), atopy (0.86), autoimmune/endocrine (0.53), and prehypertensive (0.28) types. Alopecia areata should be broadly classified as childhood (< 16 years) and adult onset with subtypes of atopic, autoimmune/endocrine, and common type under both. The prehypertensive type should be combined with the common type of alopecia areata.