When Dermoscopy Exonerates a Suspect, and “Indicts” Another Lesion

A 51-year old patient suffering from long-standing type 2 diabetes mellitus presented with a dark lesion on his forehead that had been growing for several weeks (Fig. 8.1). He had had a similar lesion several years before that had been diagnosed and treated topically as a seborrheic keratosis. Clinical examination showed a brown-grey lesion with clear but irregular margins and a smooth surface covered by a few pits. The clinical diagnosis of seborrheic keratosis was confirmed by dermoscopy.