Evaluation and diagnosis of longitudinal melanonychia: A clinical review by a nail expert group Journal of the American Academy of Dermatology Brown Line on Mom's Nail Turns Out to Be Rare Form of Melanoma Nail Apparatus Melanoma: Current Management and Future Perspectives 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 Melanotic macule of nail unit and its clinicopathologic spectrum ScienceDirect Adult and Pediatric Nail Unit Melanoma: Epidemiology, Diagnosis, and Treatment