Adult and Pediatric Nail Unit Melanoma: Epidemiology, Diagnosis, and Treatment Pigmented Lesions of the Nail Unit: Clinical and Histopathologic Features Melanonychia: moles and melanoma on the nail Dr. Podlipnik Melanonychia: moles and melanoma on the nail Dr. Podlipnik Pigmented Nail Lesions: When to Observe, When to Biopsy, When to Widely Excise, and When to Amputate? Journal of Hand Surgery Noticed a dark streak on your nail? It could be melanonychia a condition where pigmentation appears in the nail plate, often as a brown or black line. While it's commonly