Resumo: Melanoníquia, do grego mélaina, negro, sombrio, resulta de uma deposição aumentada de melanina na lâmina ungueal originada a partir da matriz ungueal. Apresenta diversas causas, entre elas, o melanoma subungueal, por isso, seu diagnóstico etiológico torna-se essencial, devendo ser o mais precoce possível. Os autores apresentam dois pacientes com melanoníquias de natureza distinta e enfatizam o seu diagnóstico diferencial. Palavras-chave: Biópsia; Lentigo; Melanoma; Unha Abstract: Melanonychia, from the Greek mélaina, means black and is the result of an increased deposition of melanin on the nail plate, originating in the nail matrix. It may have different causes, including subungueal melanoma, making early etiologic diagnosis very important.
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