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The algorithm for dermoscopy of small round or oval hairless patch on the scalp. AA: alopecia areata, TM: trichotillomania, TA: traction alopecia, TC: tinea capitis, CTA: congenital triangular alopecia, DLE: discoid lupus erythematosus, LPP: lichen planopilaris, PB: pseudopelade of Brocq.
