The difference between abdominal mass and lipoma lies in the different formation causes, different growth speed and different treatment methods. 1. Causes: The causes of abdominal mass include inflammation and infection, parasitic infection, malignant tumor and allergy, etc; while the causes of lipoma are mainly caused by the accumulation of fat particles in the local tissues and increase in size. 2. Growth speed: Generally speaking, some abdominal masses grow faster, such as cysts, hemangiomas, mesenchymal tumors and so on; while the growth speed of lipoma is slower. 3. Treatment: Most of the abdominal masses are mainly treated by surgery, while lipomas usually do not need surgery, but can be observed regularly, and can be surgically removed if they grow rapidly and show symptoms of pressure. If you are suspected of having an abdominal mass or lipoma, you should consult a doctor in time.