Lipoma is a type of tumor on the surface of the body, which is relatively common in clinical practice and often occurs in the limbs and trunk. After the development of a lipoma, a mass generally appears under the skin; the mass is tough and lobulated or flat, and the surface skin remains intact, which can be used to diagnose a lipoma. Once a lipoma develops, it may grow larger, but the growth rate is generally slow, and there are usually no obvious clinical symptoms. If a patient notices that the lipoma is enlarging, surgical removal can be considered.