(See also Overview of Skin Growths Overview of Skin Growths Cells of the skin and underlying tissue may accumulate and cause growths. Growths may be raised or flat and range in color from dark brown or black to skin-colored to red. They may be present... read more .)
Dermatofibromas are common among adults and usually appear as single firm bumps, often on the thighs or legs, and particularly in women. The bumps are usually less than half an inch in diameter. Some people develop many dermatofibromas.
These harmless bumps are caused by a certain gene.
Dermatofibromas are harmless and usually do not cause any symptoms, except for possible itching or ulceration (sores) after minor injuries.
Usually, dermatofibromas are not treated unless they become bothersome or enlarge. A doctor can surgically remove them if needed.