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Atypical Nevus
Highly variable, ranging from small, symmetric, and evenly pigmented to large (more than 6 mm), irregularly shaped, and irregularly pigmented, seen in the setting of familial melanoma and multiple (more than 100) clinically atypical nevi. It is a cutaneous marker for the dysplastic nevus syndrome, but is a controversial entity of uncertain significance outside of this syndrome. The lack of uniformity in diagnostic terms is one sign of this controversy.
Becker's NevusGenerally considered an acquired rather than congenital disorder, considered a benign lesion, a skin disorder predominantly affecting males. The nevus generally first appears as an irregular pigmentation (melanosis or hyperpigmentation) on the torso or upper arm (though other areas of the body can be affected), and gradually enlarges irregularly, becoming thickened and often hairy (hypertrichosis).
Blue nevus
Blue nevus
Flat to slightly raised, small lesion that is blue rather than black or brown; may be congenital or acquired, most common on the head, neck and extremities.
Compound NevusAn acquired pigmented lesion; small, slightly raised, evenly colored, usually on sun-exposed skin.
Congenital Melanocytic NevusCongenital nevi are pigmented lesions that are present at birth or appear during infancy and can be classified as small (less than 2 cm), intermediate (2 to 20 cm), or large (more than 20 cm). They are frequently varied in pigmentation and have irregular borders; they may be hairy and/or become progressively more hairy, and may cover large areas of the body. Involvement of the leptomeninges by benign or malignant melanocytes in a child with a large or giant congenital nevus is known as neurocutaneous melanosis.
Dermal NevusA raised (papular), nonpigmented lesion that may be mistaken clinically for a skin tag (fibroepithelial polyp) or a basal cell carcinoma.
Halo NevusCentral zone of pigment, raised or flat, with a circumferential rim of hypo-/depigmentation; may be noted as a recent change in a pre-existing pigmented lesion.
Junctional Nevus An acquired pigmented lesion; small, flat, evenly colored, usually on sun-exposed sites.
Nevus SpilusBenign melanocytic nevus with a speckled clinical appearance which may be congenital or acquired. Although it is generally considered a benign lesion, malignant changes have been reported. The true risk is unknown but is likely to be small.
Spitz Nevus
Spitz Nevus
Most common on the head and neck or extremities of children and adolescents, with decreasing incidence with increasing age. It may arise suddenly, and may rarely be multiple. It frequently is not pigmented; consequently, the clinical differential diagnosis might include a vascular lesion (angioma) or juvenile xanthogranuloma.