Epidermoid (ep-ih-DUR-moid) cysts are noncancerous small bumps beneath the skin. Epidermoid cysts can appear anywhere on the skin, but are most common on the face, neck and trunk.
Slow growing and often painless, epidermoid cysts rarely cause problems or need treatment. But you may choose to have a cyst removed by a doctor if its appearance bothers you or if it's painful, ruptured or infected. Many people refer to epidermoid cysts as sebaceous cysts, but they're different. True sebaceous cysts are less common.
They arise from the glands that secrete oily matter that lubricates hair and skin Epidermoid cysts are harmless and are almost never linked with cancer. If you're worried that it will grow into something more dangerous, check with your doctor to make sure it's not another type of skin problem. Epidermoid cysts may occur at any age; however, they most commonly arise in the third and fourth decades of life. Small epidermoid cysts known as milia are common in the neonatal period.