Also known as histiocytoma, benign fibrous histiocytoma, an extremely common, small, firm bump on the skin, which represents an overgrowth of the tissue lying between the outer and inner layers of skin. They are generally pinkish-brown in color and are often found on the legs. They usually occur alone and have no symptoms whatsoever. Sometimes more than one appears. Generally, dermatofibromas are harmless and have no connection to skin cancer.