Derm Dx: Discolored toenail

A patient, aged 72 years, presented with concerns about discoloration of a toe nail, which he first noted four weeks ago. The patient denied antecedent trauma or a similar condition in past.

Examination revealed reddish black pigmentation of a lateral nail fold. There was no diffusion of pigment or significant joint changes. Dermoscopic examination revealed well circumscribed annular dots dispersed in ...