Skin cysts are fluid-filled sacs that grow under the skin. They are often surrounded by a thick fibrous capsule, and can contain a strange-smelling, cheese-like material formed from keratin (the protein that makes up your skin, hair, and nails).
Who Gets Skin Cysts?
Anyone can get a skin cyst, but they are more common in middle-aged individuals and in men. Additionally, users of anabolic steroids are more likely to develop skin cysts, due to their higher levels of testosterone.