WARNING! Contains images of a graphic nature. The excision of a sebaceous cyst, a cyst is unlike a pimple that exudes sebum. A sebaceous cyst usually contains keratin which is the same material our hair and fingernails are made from. I have a fairly large one on my shoulder that has been there for over 20 years about the size of a large grape I call him Fred its no big deal. If you have any lumps get them checked immediately by your GP. So sit back and watch the removal of the cyst!