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January 1990

Congenital Common Blue Nevus

Author Affiliations

Dermatology Service

Department of Internal Medicine Madigan Army Medical Center Fort Lewis, WA 98431

Arch Dermatol. 1990;126(1):124-125. doi:10.1001/archderm.1990.01670250130030

To the Editor.—  Blue nevi are usually acquired small pigmented lesions most often located over the extremities or scalp. Congenital onset for blue nevi is unusual. Histologically, common blue nevi appear within the dermis as slender, elongated melanocytes with long dendritic processes filled with fine melanin granules.1 Herein, we describe a patient with a large congenital common blue nevus.

Report of a Case.—  A healthy, white, 3700-g female infant was born on March 26,1988, with a blue patch over the right frontal aspect of the scalp. No other cutaneous lesions were present, nor was there any evidence of cranial or other congenital malformation. She was evaluated at age 8 months and found to have a 7 × 5-cm,evenly colored, dark-blue patch over the right parietal aspect of her scalp, without a palpable component (Fig 1). A 3-mm punch biopsy specimen from the center of the patch demonstrated spindle-shaped, dendritic cells with melanin granules within the middle

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