A dermatofibroma is a very common, button-like dermal nodule, usually occurring on the extremities, important only because of its cosmetic appearance or its being mistaken for other lesions, such as malignant melanoma when it is pigmented. The lesion may be tender.
Causes of Dermatofibroma
We don’t know why people grow dermatofibromas. Some may be caused by insect bites. They are harmless and never turn cancerous.
Symptoms of Dermatofibroma
Dermatofibromas feel like hard lumps under the skin. They’re like an iceberg in that there is more under the skin than seen on the surface. Often these start out as red, turning later to brown, and sometimes itch. They probably are a reaction to a minor injury, such a bug bite or a splinter.
Diagnosis
Clinical findings, “dimple” sign.
Treatment
Surgical removal is not usually indicated, as the resulting scar is often less cosmetically acceptable than the dermatofibroma. Indications for excision include repeated trauma, unacceptable cosmetic appearance, or uncertainly of clinical diagnosis.
Cryosurgery Cryosurgery with a cotton-tip applicator is often effective and produces a cosmetically acceptable scar in most patients.
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