A 49-year-old woman presented with a 30-year history of asymptomatic plaque on her right temple. Dermatological examination revealed a 1.5 cm in diameter, erythematous to flesh colored, flat topped plaque with hairs (Fig. 1). She had no history of drug intake or medical illness. The histological examination showed a dense proliferation of benign nevus cells in the upper dermis. They were arranged in nests surrounding the hair follicles (Fig. 2). Bony spicules were seen in the lower dermis, underneath the nevus cell nests. Some of them were compact while others were surrounded by mature fatty tissue (Fig. 3).
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Fig. 1. A 1.5 cm in diameter

Fig. 1. A 1.5 cm in diameter, slightly erythematous to flesh colored, flat-topped hairy plaque on the right temple of the face.

Fig. 2. Nests of nevus cells were seen

Fig. 2. Nests of nevus cells were seen within the upper dermis, and bony spicules surrounding the mature fatty tissue were observed in the lower dermis, underneath the nevus cell nests (Hematoxylin-eosin, x40).

Fig. 3. Bony spicules containing numerous

Fig. 3. Bony spicules containing numerous osteocytes (Hematoxylin-eosin, x 100).