atypical mole (ay-TIH-pih-kul mole)
A type of nevus (mole) that looks different from a common mole. An atypical mole is often larger with borders that are not easy to see. Its color is usually uneven and can range from pink to dark brown. Parts of the mole may be raised above the skin surface. An atypical mole may develop into malignant melanoma (a type of skin cancer). Also called dysplastic nevus.