Acne is the common name for sebaceous cysts, a type of sebaceous secretion storage that occurs mostly on the face and back. When sebaceous cysts appear on the back, you can go to dermatology, general surgery and other departments depending on the severity of the symptoms combined with the relevant medical history. If there are no symptoms other than the cysts and the cysts are small, they can be followed up and observed for the time being. If the cyst becomes red, swollen, hot and painful, and pus forms, surgical incision and drainage is needed, along with anti-inflammatory medication. When the cyst grows too large and exerts pressure on the surrounding tissues, surgical removal is needed. When sebaceous cysts are found on the back, patients can choose the appropriate department according to their symptoms and receive standardized treatment in time.