are a closed sac under the skin filled with a cheese-like or oily material known as keratin. They are commonly seen on the scalp, labia, scrotum, chest, and back, but can be found anywhere on the body. Cysts are often the result of swollen hair follicles, or skin trauma. Cysts may become inflamed and appear red, swollen, and tender. Cysts may be surgically removed by our dermatology team.