A 5cm lipoma is recommended to be removed surgically. 5cm lipoma is relatively large and has the following hazards if it is on the surface of the body: 1. it affects the aesthetics. 2. if the lipoma increases again, it will be more difficult to operate. 3. the blood supply inside the lipoma may become impaired after a long period of time and there is a possibility that bleeding inside the lipoma may lead to painful lipoma. 4. a large lipoma may form malignant changes, which is the formation of liposarcoma. This is the formation of liposarcoma. Lipoma removal can be performed under local anesthesia with lidocaine, and the lipoma can be completely removed after cutting the skin. In the case of back lipoma, the boundary between the lipoma and the normal fatty tissue is not very clear because of long-term sleep pressure, so it is a little more difficult to remove it surgically.