Epidermal cysts, also known as keratocysts, are one of the most common skin cysts, a cyst containing keratin in the dermis, the walls of which are composed of epidermis This cyst lesion is a hemispherical elevated swelling, slow growing, normal skin color, movable, 12.5px to several centimeters in diameter, slow growing, to a certain extent that no longer grows, generally no conscious symptoms, secondary infection can occur when painful. It is usually limited to intracapsular infection, followed by abscess formation or pericapsular cellulitis, and repeated infections can lead to hardening of the surrounding connective tissue hyperplasia skin. The swelling can occur anywhere, but often occurs on the scalp, face and neck, trunk, and buttocks. The lesions are often solitary, but can be multiple on the head and face in Gardner’s syndrome. Note for patients with epidermoid cysts: 1. Do not ignore small cysts as insignificant. 2. When the cyst becomes pus, it should be drained first and then surgically removed when the wound heals. 3, pay attention to diet and life conditioning, avoid eating too fatty and fried hot food, eat more fresh vegetables. 4, can take antibiotic drugs under the guidance of the doctor. Surgery is the main method to treat epidermoid cysts completely. During surgery, a shuttle-shaped skin incision is designed along the direction of the skin grain and removed together with the cyst. Special care should be taken when separating the cyst, as the cyst wall is very thin and should be removed as completely as possible. If the cyst wall remains, it is easy to recur. If there are signs of inflammation such as redness, swelling and heat before surgery, the inflammation should be controlled first and the hand should be arranged later.