Ulcerative necrobiosis lipoidica: case report of an atypical presentation and literature review.

Necrobiosis lipoidica (NL) is a rare chronic granulomatous degenerative skin disease by unknown causes, which is mostly associated with diabetes mellitus, usually presenting with typical plaques of the shins. Although less common, some ulcerative forms may be seen in clinical practice. The occurrence of an atypical presentation in one of our patients was the occasion to review the pertinent literature.