Sebaceous Cysts
Sebaceous cysts are common skin cysts that can pop up really anywhere on the body but are more frequently seen on the head, back of the ears, neck, and trunk. They are believed to result from a clogged hair follicle or skin trauma. In addition, some genetic disorders like Gardner's syndrome may predispose a person to develop sebaceous cysts.

Some confusion arises around "sebaceous cysts" as these cysts contain keratin, and not sebum (oil) because they originate from the outer layer of the skin (the epidermis) and not the sebaceous glands. In fact, the true name for sebaceous cyst is an epidermoid cyst, although many people, even health care professionals, still erroneously use the term sebaceous cyst. Given that the term sebaceous cyst is still often used in the medical community, this article will refer to the cyst as such.