MedTerms Medical Dictionary

Nevus: 1. Any birthmark.
2. A benign pigmented spot on the skin such as a mole (a cluster of melanocytes and supportive tissue that appears as a tan, brown, or flesh-colored spot on the skin).
3. A benign blood vessel tumor on the skin such as a vascular nevus, a local collection of capillaries of the skin (a strawberry birthmark, stork mark, or port wine stain).
From the Latin naevus meaning a body mole, especially a birthmark. The plural of nevus is nevi.

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