Figure 2: (a and b) The right middle finger nail showed a longitudinal melanonychia involving < 1/4^th of the nail with a subungual hyperpigmented mass protruding beyond the distal nail margin. (c) (H and E, ×40): Longitudinal excisional biopsy of nail lesion showed thickened nail plate, acanthotic epidermis, and atypical keratinocytes spanning the entire epidermis. (d) (H and E, ×400): Longitudinal excisional biopsy of nail lesion showed atypical keratinocytes