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Alopecia areata and trichotillomania have several attributes histopathologic in common, namely, some follicles in catagen and often in telogen, long fibrous tracks behind shortened follicles and, in sections from some specimens, and hardly any perivascular infiltrates of inflammatory cells in the dermis. Granulomatous inflammation is a rare denominator in common of alopecia areata and trichotillomania, […]