Dermoscopic features of nail matrix nevus (NMN) in adults and children: A comparative analysis ScienceDirect Melanonychia Striata Longitudinalis (MSL): Pigmented bands Academic Dermatology of Nevada Melanonychia: Clues for Diagnosis and the Importance of Histology Next Steps in Dermatology Diagnosis and management of nail pigmentations ScienceDirect Adult and Pediatric Nail Unit Melanoma: Epidemiology, Diagnosis, and Treatment This dark line or discoloration on the nail can be a common condition called melanonychia, basically, extra pigment in the nail plate. In many people, especially those with more melanin in their