Keratoacanthoma:  a frequent but rarely recognized skin lesion confused with squamous carcinoma.
D002277:Carcinoma; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D007636:Keratoacanthoma; D012871:Skin Diseases; D012878:Skin Neoplasms / Q000175:diagnosis*
CARCINOMA, EPIDERMOID/differential diagnosis; SKIN NEOPLASMS/differential diagnosis