Pathogenesis: The precipitating factor that initiates the formation of a dermatofibroma is thought to be superficial trauma, such as from a bug bite, which causes the fibrous tissue proliferation. The exact etiology is unknown.
Treatment: Most dermatofibromas are not treated in any manner. Complete elliptical excision with a minimal 1- to 2-mm margin is curative. The resulting scar may be more noticeable than the initial dermatofibroma. There is no evidence to support the routine removal of these common tumors to prevent malignant degeneration into a DFSP.
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