Pilomatricoma presenting with localized alopecia.

A 5-year-old Japanese girl presented with a 4-month history of a solid dermal tumor on the left side of her forehead. She had neither diathesis for autoimmune disorders nor family history of alopecia areata. Her left eyebrow and vellus hairs around the tumor had been lost as the tumor grew. Examination revealed a 1 cm, bluish, solid, dermal tumor surrounded by a 5-cm diameter alopecia, where the left eyebrow and the vellus hairs on the forehead were missing (figure 1A). A presumptive clinical diagnosis [...]