- A rapidly growing skin tumor that occurs especially in elderly individuals, resembles a carcinoma of squamous epithelial cells but does not spread, and tends to heal spontaneously with some scarring if left untreated.
Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.
- A benign (noncancerous), rapidly growing skin tumor that usually occurs on sun-exposed areas of the skin and that can go away without treatment.
National Cancer Institute
See also Understanding Medical Terminology.