By Gary M. White, MD
The blue nevus (BN) is a common, melanocytic proliferation in the dermis. The deeper location is the reason for the typical blue color (Tyndall effect). The diagnosis of cellular blue nevus is made histologically. Clinically, it is typically larger (e.g., a 1 cm nodule) and often found on the buttocks. See also blue nevus, plaque-type and malignant blue nevus.
A blue papule 2-6 mm in diameter on the scalp, face, dorsa of the hands or feet, or on the buttocks is characteristic. A giant blue nevus may occur on the scalp congenitally, in childhood or in adulthood. Very rarely, the blue nevus may be hypopigmented [Dermatología Argentina Vol. 23 Nº 1 Marzo de 2017: 34-37].
Rarely melanomas have developed from blue nevi (aka malignant blue nevi).
The vast majority of blue nevi do not need intervention. However, the sudden change or growth of a previously stable blue papule or plaque should prompt a biopsy. Otherwise, surgical removal is only done for cosmetic reasons.
A congenital blue nevus on the buttocks.
Combination intradermal nevus with blue nevus.
Blue nevi in a patient with a cardiac myxoma. Coincidence??
Congenital blue nevus on the back of a 2-year-old.
A blue nevus of the fingertip.
Collision tumor of blue nevus and compound nevus.
A blue nevus on the side of the foot.
Blue nevus of the palate. A BN in the oral cavity is rare. However, among the nevi of the oral cavity, blue nevi is the second most common form. A blue nevus in the oral cavity typically presents between the third and fifth decades of life and the hard palate is the most frequently involved site.
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