Epidermoid Cysts
Epidermoid cysts are the most common type of cyst in humans. Epidermoid cysts are also called epithelial or sebaceous cysts. They appear as a light tan or yellow bump, and most often occur on the face, scalp, and nape of the neck or back. Most epidermoid cysts are formed by a build-up of keratin (a protein) with no way for the keratin to get to the surface of the skin. The skin cells build up and form a cyst. Sometimes, epidermal cells are displaced or entrapped during embryonic development. They then form keratin which can’t get to the surface of the skin, and a cyst is formed. The contents of the cysts appear cheesy and are often foul-smelling. These cysts never become cancer.
Epidermoid cysts may be watched for years, often cause no trouble, and may go away by themselves. These are benign bumps, which often do not need to be treated. You may want them treated if they become red, tender, or drain though. Antibiotics can be prescribed to decrease the inflammation and, in some cases, the cyst will be injected with steroids.
Treatment
Surgery.
This will leave a scar. As with all minor surgeries, there is a small risk of infection.
Incision and drainage.
Sometimes the cyst wall (sac that contains the contents of the cyst) can be removed through a small cut in the roof of the cyst after the contents have been emptied. But if any of the wall is left behind, the cyst will most likely recur.
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UW Dermatology Department 1 S. Park St 7th Floor Madison, WI 53715 Clinic: 608 287-2450 |
American Family Children’s Hospital Pediatric Dermatology Specialty Clinic 1675 Highland Ave. Madison, WI 53792 Clinic: 608 263-6420 |
The Spanish version of this Health Facts for You is #7159.
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Last Updated: 02/23/2011
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