Nail Matrix Nevus Springer Nature Link Melanonychia is brown or black discolouration of a nail. It may be diffuse or take the form of a longitudinal band. Melanonychia can present in individuals of all ages, including children, and Diagnosis and management of nail pigmentations ScienceDirect Dermoscopic features of nail matrix nevus (NMN) in adults and children: A comparative analysis ScienceDirect
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