NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,798 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

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.