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A small, slow-growing, noncancerous lump in the skin.

A sebaceous cyst (epidermoid cyst) is a small, slow-growing, noncancerous bump beneath the skin.

It's most commonly found on the face, neck, and trunk of the body. Often painless, sebaceous cysts rarely cause symptoms or need treatment.

A doctor can remove one if it's painful or infected or if the appearance is a concern.