has_disease_location skin disorder zone of skin nevus true cutaneous nevi Wikipedia:Nevus MedDRA:10029391 nevus (disorder) MESH:D009506 Nevus (or naevus, plural nevi or naevi, from nævus, Latin for "birthmark") is the medical term for sharply circumscribed[1] 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.[2] Using the term nevus and nevi loosely, most physicians and dermatologists are actually referring to a variant of nevus called the "melanocytic nevus", 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. James Malone nevus, NOS Sirarat Sarntivijai OMIM:162900 Mole NOS cutaneous nevus Mole of skin skin mole, NOS Tomasz Adamusiak MedDRA:10029384