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A melanocytic nevus (also known as nevocytic nevus, nevus-cell nevus, and commonly as a mole) [1] [2] is usually a noncancerous condition of pigment-producing skin cells. It is a type of melanocytic tumor that contains nevus cells . [ 2 ]
However, a melanocytic nevus is benign, and melanoma is malignant. Most melanocytic nevi never evolve into a cancer, with the lifetime risk for an individual nevus being 1 in 3000 for men and 1 in 11 000 for women. [5] Moreover, dermatologists have a standardized system for determining whether a skin lesion is suspicious for malignant melanoma.
Medium-sized congenital melanocytic nevus is defined as having a diameter more than 2 cm (0.79 in) but less than 20 cm (7.9 in). [6]: 690 Giant congenital melanocytic nevus (also known as "bathing trunk nevus," "garment nevus," "giant hairy nevus", and "nevus pigmentosus et pilosus") is defined by one or more large, darkly pigmented and ...
Nevus (pl.: nevi) is a nonspecific medical term for a visible, circumscribed, chronic lesion of the skin or mucosa. [1] The term originates from nævus , which is Latin for " birthmark "; however, a nevus can be either congenital (present at birth) or acquired.
Melanocytic nevi and neoplasms are caused by either a proliferation of (1) melanocytes, or (2) nevus cells, a form of melanocyte, but which lack dendritic processes. Contents Top
A Spitz nevus is a benign skin lesion.A type of melanocytic nevus, it affects the epidermis and dermis. [1]It is also known as an epithelioid and spindle-cell nevus, [2] and misleadingly as a benign juvenile melanoma, [2]: 691 and Spitz's juvenile melanoma [3]).
The acral nevus is a benign skin lesion that can occur at any age, but is generally noticed between 10 and 30 years of age. Both children and adults may be observed with this skin lesion. The prevalence of acral nevi increases directly with degree of skin pigmentation.
Nevus cells are a variant of melanocytes. [1]: 684 They are larger than typical melanocytes, do not have dendrites, and have more abundant cytoplasm with coarse granules. [2] They are usually located at the dermoepidermal junction or in the dermis of the skin. Dermal nevus cells can be further classified: type A (epithelioid) dermal nevus cells ...