Skin cysts are usually epidermoid cysts, i.e. sebaceous cysts. Sebaceous glands are abundant in the skin, especially in the head, face, forehead and back. If the outlet of sebaceous glands is blocked, the sebum cannot be discharged and is clogged in the sebaceous glands, which can easily be infected by bacteria to form sebaceous cysts. Skin cysts are benign cysts that are generally not contagious, but sebaceous cysts can easily be infected by bacteria. Therefore, once a skin cyst is found, it is recommended that it be treated promptly. Current treatment methods include laser, surgery, etc. The appropriate treatment method should be developed according to different situations.