keratoacanthoma: skin tumor that grows rapidly (especially in older people) and resembles a carcinoma but does not spread; it usually disappears spontaneously, often leaving a scar
growth: (pathology) an abnormal proliferation of tissue (as in a tumor)
bernese mountain dog: large powerful long-haired black-coated Swiss dog with deep tan or russet markings on legs and white blaze and feet and chest marking; formerly used for draft