Piedra is a hair disease caused by a fungus, which causes formation of nodules on the hair shaft.Veasey JV, Avila RB, Miguel BAF, Muramatu LH. White piedra, black piedra, tinea versicolor, and tinea nigra: contribution to the diagnosis of superficial mycosis. ''An Bras Dermatol''. 2017 May-Jun;92(3):413-416. Types include: * White piedra * Black piedra

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{{Mycoses Mycosis-related cutaneous conditions Animal fungal diseases Human hair