Dermatofibroma

Dermatofibromas, also known as benign fibrous histiocytomas, are one of the most common skin growths. They are most often found on legs of adults as firm, hyperpigmented bumps, usually less than a centimeter in diameter. Benign dermatofibromas can also be found on the arms and trunk and can grow larger than 3 centimeters. Dermatofibromas are believed to be a result of trauma or insect bites that cause a harmless growth of cells called fibroblasts, or scar tissue, in the deeper layer of skin. 

These growths are usually asymptomatic but may be itchy or irritated if traumatized or when shaved. They are diagnosed clinically and have a characteristic sign of dimpling when pinched.

A skin biopsy may be required if the diagnosis is uncertain or if there are changes or symptoms associated with the growth. Sometimes, skin cancers can mimic normal growths and a biopsy will help differentiate from a dermatofibroma from basal cell cancers, keratoacanthomas, and dermatofibrosarcoma protuberans (DFSP). 

Usually, no treatment is required unless the growth is symptomatic. Surgical excision is done for changing or bleeding lesions or when the growth is suspicious for malignancy. Cosmetic removal can be done when requested, however, it is highly discouraged because the scar can look worse than the initial growth, especially on the lower extremities. Surgical treatments on the legs often get infected so extra precautions should be taken during the healing time. Liquid nitrogen cryotherapy is another treatment option for lesions that protrude above the skin surface.

If you have a raised lesion you are concerned about, our dermatologists can evaluate you and recommend treatment if necessary.