Things are not always what they are assumed to be.
D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis*; D003951:Diagnostic Errors; D006801:Humans; D007636:Keratoacanthoma / Q000175:diagnosis*; D008297:Male; D009059:Mouth Diseases / Q000175:diagnosis*; D009062:Mouth Neoplasms / Q000175:diagnosis*