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An epidermal
cyst is a common slow-growing bump consisting of a thin sac of skinlike
material containing a cheesy substance composed of skin secretions.
Epidermal cysts, often incorrectly referred to as sebaceous cysts, are flesh-colored and range from ½ to 2 inches across. They can appear anywhere but are most common on the scalp, back, and face. They tend to be firm and easy to move within the skin. Epidermal cysts are not painful unless they become infected or inflamed.
Large epidermal cysts are removed surgically after an anesthetic is injected to numb the area. The thin sac wall must be removed completely or the cyst will grow back. Small cysts may be injected with corticosteroids if they become inflamed. Infected cysts are treated with an antibiotic and cut open to drain. Tiny cysts that are bothersome can be burned out with an electric needle.
Because sunlight may stimulate growth of epidermal cysts, fair-skinned people are advised to stay out of the sun and to use protective clothing and sunscreen (see Sunlight and Skin Damage: Introduction).
Last full review/revision February 2003
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