Pyoderma gangrenosum of the lip involving the oral cavity: a case report and literature review

A 76-year-old male presented with sudden onset of a painful ulcerative lesion involving firstly the lower lip and secondly the oral cavity. The lesion initially started as a nut-sized round erythematous patch on the lower lip and rapidly progressed into a necrotic ulcer within three days (figure 1A). Thereafter, the ulcer gradually extended to the buccal gingiva, teeth, and tip of the tongue (figure 1B). There was no past history of burn or trauma on the area. Six years ago, he was diagnosed with [...]