Lipomas are very common in clinical practice, often found on the limbs and trunk. They are relatively superficial tumors located under the skin, composed of fatty tissue. Most patients do not exhibit obvious clinical symptoms and only discover a mass under the skin. The mass typically appears lobulated or flat, is fairly firm, and does not present any redness on the surface. It can be moved, which is a characteristic manifestation of lipomas. However, a very small number of patients may experience pain in the lipoma, at which point surgery can be considered to alleviate the pain.