HEALTH ENCYCLOPEDIA

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Epidermoid Cysts

What are epidermoid cysts?

Epidermoid cysts, also called sebaceous, keratin, or epithelial cysts, are small, hard lumps that develop under the skin. These cysts are common. They grow slowly. They do not cause other symptoms and are nearly never cancerous. Epidermoid cysts are often found on the face, head, neck, back, or genitals. They can range in size from 1/4 inch to 2 inches across. They look like a small bump, are tan to yellow in color, and are filled with thick, smelly matter. They do not cause any pain and can usually be ignored.

What causes epidermoid cysts?

Epidermoid cysts are usually caused by a buildup of keratin. Keratin is a protein that occurs naturally in skin cells. Cysts develop when the protein is trapped below the skin because of disruption to the skin or to a hair follicle. These cysts often develop in response to skin trauma, HPV infection, acne, or excessive exposure to the sun. An epidermoid cyst is more likely to develop in people with acne or other skin conditions.

How are epidermoid cysts diagnosed?

To diagnose epidermoid cysts, a physician will examine the bump and surrounding skin, as well as take a medical history. They will ask for details on how long the bump has been present and whether it has changed over time. Physicians can usually diagnose an epidermoid cyst by examination only, but sometimes an ultrasound or a referral to a dermatologist is needed to confirm the diagnosis.

How are epidermoid cysts treated?

Most epidermoid cysts either stop growing or go away on their own without treatment. Physicians will usually make note of a cyst and monitor it during each checkup to make sure that it has not changed. Since epidermoid cysts are very rarely cancerous, they do not pose a risk. Most are never treated.

Treatment may be required if the cyst becomes red, swollen, painful, changes in size or character, or is infected. In such cases, treatment options include antibiotics and drainage. Sometimes the cyst may need to be surgically removed. It can also be removed for cosmetic reasons.

What is the outlook for epidermoid cysts?

In most cases, epidermoid cysts cause no long-term problems. Squeezing out the contents of the cyst on your own can lead to infection, so it’s best to leave the cyst alone.

Once a cyst is drained, there is a possibility that it will grow back. Very rarely, epidermoid cysts can become cancerous. Any significant change in a cyst is reason to see your doctor.


Content licensed from:

Written by: Amber Erickson Gabbey
Medically reviewed on: Dec 15, 2016: George Krucik, MD, MBA

This feature is for informational purposes only and should not be used to replace the care and information received from your health care provider. Please consult a health care professional with any health concerns you may have.
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