title: Persistent oral ulcer.
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008875:Middle Aged; D009059:Mouth Diseases / Q000473:pathology*; D009062:Mouth Neoplasms / Q000473:pathology*; D014456:Ulcer / Q000473:pathology