<unk>  (or<unk> , plural nevi or naevi, from<unk> , Latin for "birthmark") is the medical term for sharply circumscribed and chronic lesions of the skin or mucosa. These lesions are commonly named birthmarks or beauty marks. Nevi are benign by definition. However, 25% of malignant melanomas (a skin cancer) arise from pre-existing nevi. Using the term<unk>  and nevi loosely, most physicians and dermatologists are actually referring to a variant of<unk>  called the "melanocytic<unk> ", which are composed of melanocytes. Histologically, melanocytic nevi are distinguished from lentigines (also a type of benign pigmented macule) by the presence of nests of melanocytes, which lentigines (plural form of lentigo) lack.
Nevus
Papilloma
Xanthoma
Blue nevus
Acral nevus
Papulosquamous lesions
Angiokeratoma
Lipoma