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March 1997

A Congenital Pink Plaque

Arch Dermatol. 1997;133(3):383-384. doi:10.1001/archderm.1997.03890390123019

REPORT OF A CASE  A 26-year-old white woman sought medical attention for a birthmark on her abdomen. The growth was stable in size and asymptomatic but had become "pinker" over the last several years. There was no family history of a similar skin abnormality, and the patient denied any other dermatologic or medical problems.Physical examination revealed a 3.0×2.5-cm faintly pink plaque studded with multiple papules on the left side of her abdomen (Figure 1). No other cutaneous abnormalities were seen.A shave biopsy specimen was obtained from the skin lesion (Figure 2 and Figure 3).What is your diagnosis?

DIAGNOSIS:  Basaloid follicular hamartoma.

HISTOPATHOLOGIC FINDINGS  Histologically, the lesion demonstrated anastomosing cords and strands of squamoid epithelium with smaller nests of basaloid cells. These were connected to the overlying epidermis, and in the superficial dermis, they were embedded in a loose fibrovascular stroma. An

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