Dermatofibroma. These are benign dermal nodules that represent a focal proliferation of fibroblasts; the overlying epidermis is slightly thickened. Their occurrence is not unusual in children and adolescents. Dermatofibromas are firm and may be black, red, brown, or flesh-colored. Their diameter generally ranges from 0.5 to l.5 cm, although they may occasionally be larger. Dermatofibromas may be solitary or multiple, and they develop either spontaneously or after minor trauma to the skin, such as an insect bite. Most are asymptomatic but sometimes may be painful on palpation. A very useful diagnostic maneuver is executed by exerting lateral pressure on the lesion. The skin overlying a dermatofibroma will frequently dimple. Dermatofibromas require surgical treatment only when they are of cosmetic concern to the patient. However, biopsy analysis is occasionally required in order to confirm the diagnosis and to differentiate it from more serious disorders.
Color Atlas of Pediatric Dermatology
Samuel Weinberg, Neil S. Prose, Leonard Kristal
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