Subungual Melanocytic Lesions: Key Clinical and Pathologic Concepts and Biopsy Techniques Actas Dermo Sifiliogrficas Melanotic macule of nail unit and its clinicopathologic spectrum ScienceDirect Pigmented Nail Disorders Obgyn Key Brown black pigmented nail bands (melanonychia) can be a sign of subungual melanoma. This case report describes a child with melanonychia mimicking melanoma caused by green slime. Presumably, the slime embedded in the Differential diagnosis of pigmented nail lesions Anais Brasileiros de Dermatologia