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Mycological examinations for tinea nigra: (A) Direct mycological examination of a sample collected through skin lesion scraping, clarified with KOH 10%, illustrating dematiaceous septate hyphae. (B) Culture Mycosel medium (Difco, USA) with dematiaceous colony with a waxy appearance. (C) Microgrowth revealing dematiaceous yeasts with binary fission, typical of Hortaea werneckii
