Lipoma is a kind of very common benign tumor in life, which normally will not deteriorate and become cancerous, so it does not need special treatment. What are the harmful effects on the body? Actually, there are no harmful effects, the most important thing is that it affects the aesthetic appearance, and if it grows in the functional part, it may also affect the normal use of certain functions. First, there is a layer of thin connective tissue capsule around the lipoma, and inside there are normal fat cells which are divided into leaf-like groups by connective tissue bundles. Some lipomas contain more connective tissues or blood vessels in addition to a large amount of adipose tissue in their structure, that is to say, they form complex lipomas. Although the harm of lipoma will not endanger the patient’s life, when the tumor is getting bigger and bigger, the harm of lipoma will seriously affect the patient’s breathing and life and health. Secondly, lipoma is a kind of benign tumor, mostly occurring under the skin. There is a thin layer of connective tissue encapsulation around the tumor, and inside there are normal fat cells that are divided into leaf-like groups by connective tissue bundles. Some lipomas contain more connective tissue or blood vessels in addition to a large amount of adipose tissue in their structure. Thirdly, the specific harm of lipoma: single subcutaneous lipoma can be surgically excised if it leads to motor dysfunction; multiple small lipomas don’t need to be dealt with because of self-limitation, and even can disappear by themselves; deep lipoma has the possibility of malignant transformation, i.e., it will become liposarcoma, so it should be closely observed and reviewed by regular B-ultrasound. If proliferation is rapid or pressure symptoms appear, it should be surgically excised and pathologically sectioned; if it has become liposarcoma, it should also be observed and treated after surgery in order to increase the percentage of cure. What are the causes of liposarcoma? The specific causes of liposarcoma are still unclear, and the possible factors include: (1) Dietary factors: drinking a lot of alcohol, eating too much spicy, greasy food or high cholesterol food such as animal offal. (2) High pressure and depressed mood: Long-term work or life pressure is too high, depressed mood, which can easily cause fat metabolism abnormality and lead to the production of lipoma. (3) Lifestyle habits: bad lifestyle habits, staying up late, lack of exercise, sedentary, etc. may lead to decreased fat decomposition in the body. (4) Others: such as heredity, drug factors and so on.