A dermatofibroma is a harmless growth of the second, or lower layer of the skin. It
is made up of scar tissue and blood vessels. It may appear as a skin-colored firm
bump that dimples when you pinch it. It usually occurs after insect bites or trauma
to the skin.
These tumors are common but harmless, and it is common to have more than one
lesion. They do not go away on their own. They rarely get larger than the size of a
nickel. If they get bigger very quickly or become painful, you should have them
1. The raised part of-the lesion can be shaved off, leaving it flat with the skin that
surrounds it. The deep portion of the tumor will remain and so the growth may
2. Your dermatologist may remove the lesion by cutting around and below it to
remove all of the tissue. He or she will then sew (suture) it closed. This will
leave a scar and there is a slight risk of infection.
3. Your dermatologist may also freeze the tumor with liquid nitrogen. This may
cause the area to blister and crust but it should heal with little or no scarring.
Sometimes there may be a permanent light or dark spot left at the site. This
treatment may not cause the tumor to go away completely.
UW Dermatology Department
1 S. Park St 7th Floor
Madison, WI 53715
American Family Children’s Hospital
Pediatric Dermatology Specialty Clinic
1675 Highland Ave.
Madison, WI 53792
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have any questions. If this information was not given to you as part of your care, please check with your doctor. This
is not medical advice. This is not to be used for diagnosis or treatment of any medical condition. Because each
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this information. If you have an emergency, please call 911. Copyright ©10/2015. University of Wisconsin Hospitals
and Clinics Authority. All rights reserved. Produced by the Department of Nursing. HF#6457.