title: Acute oral ulcer.
mesh_terms: D002601:Chancre / Q000473:pathology*; D006801:Humans; D008047:Lip Diseases / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009061:Mouth Mucosa / Q000473:pathology; D013587:Syphilis / Q000473:pathology*; D014456:Ulcer / Q000473:pathology