Sebaceous cysts are harmless, slow-growing bumps under the skin, often appearing on the scalp, face, ears, back, or groin area. The cysts usually contain dead skin and other skin particles.
Warm moist compresses placed over the cysts may help them drain and heal. Sebaceous cysts can usually be treated by a physician by puncturing the top and removing its contents.
However, large cysts may reappear and may have to be surgically removed. If a cyst becomes swollen, tender, large, or infected, treatment may include administering antibiotics and then surgically removing the cyst.