Dermatofibroma

Dermatofibromas are harmless benign skin growths, found especially on the legs, that range in size from about 0.5 to 1 cm. They are hard papules (rounded bumps) that may appear in a variety of colors, usually brownish to tan. Typical dermatofibromas cause little or no discomfort, although itching and tenderness can occur. Some physicians and researchers believe dermatofibromas form as a reaction to previous injuries such as insect bites or thorn pricks. They are composed of disordered collagen laid down by fibroblasts. Rarely, basal cell carcinoma may develop in a dermatofibroma.

Dermatofibromas occur most often in women: the male to female ratio is about 1:4. Most physicians will advocate treatment only if the lesion is in the way of shaving, or is becoming irritated by clothing. Removal can be done surgically with local anesthesia, but since much of the growth extends beneath the surface of the skin, the scar may be larger and more noticeable than the original tumor. Cryosurgery may also be used to remove a dermatofibroma.