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    Tinea versicolor, tinea nigra, white piedra, and black piedra.

    Clin Dermatol 2010 Mar;28(2):140-5
    Dermatology Service and Mycology Department, General Hospital of Mexico DO, Dr. Balmis 148, Colonia Doctores México DF, 06720, Mexico.
    Superficial mycoses are fungal infections limited to the stratum corneum and its adnexal structures. The most frequent types are dermatophytoses or tineas. Tinea versicolor involves the skin in the form of hypochromic or hyperchromic plaques, and tinea nigra affects the skin of the palms with dark plaques. White piedra and black piedra are parasitic infections of scalp hairs in the form of concretions caused by fungal growth. Diagnosis of these mycoses is made from mycologic studies, direct examination, stains, and isolation, and identification of the fungi. Treatment includes systemic antifungals, topical antifungals, and keratolytics.
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