alopecia areata(redirected from Jonston alopecia)
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alopecia areata[‚a·lə′pē·shə ‚a·rē′ad·ə]
A type of alopecia that is characterized as an autoimmune disorder and usually presents with one or many oval, slightly erythematous, asymptomatic patches of hair loss.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.