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(Benign Fibrous Histiocytomas)

by Denise M. Aaron, MD

Dermatofibromas are firm, red-to-brown, small papules or nodules composed of fibroblastic tissue. They usually occur on the thighs or legs but can occur anywhere.

Dermatofibromas are common among adults, more so in women. Their cause is unknown, but they have been occasionally attributed to previous insect bites. Lesions are usually 0.5 to 1 cm in diameter, firm, and may dimple inward with gentle pinching. Most lesions are asymptomatic, but some itch or ulcerate after minor trauma. Diagnosis can often be made clinically. Lesions are sometimes biopsied to exclude melanocytic proliferation (eg, nevus, solar lentigo, melanoma) or other tumors. Dermatofibromas that cause troublesome symptoms can be excised.

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