Skin cysts are a thin lining filled with a cheese like material made of keratin. There are many different types of cysts that effect the skin but the most common are:
Epidermoid cysts, often incorrectly called sebaceous cysts, which are formed within the dermis arising from hair follicles. They have a central depression or punctum.
Trichilemmal cyst, also known as a pilar cyst, is a keratin-filled cyst that originates from the outer hair root sheath. Trichilemmal cysts are most commonly found on the scalp and are usually diagnosed in middle-aged. They often run in the family. Unlike epidermoid cysts they often lack a central depression/punctum.
Cysts can become painful and on occasion are unsightly causing distress. Cyst removal surgery involves a small incision under local anaesthetic. As long as the cyst lining is fully removed it should not recur. If you are having a cyst removed ensure your surgeon is trained in the recognition and surgical treatment of cysts. Incomplete removal will allow the cyst to regrow.