Subcutaneous effusion after surgery needs timely suction, pressure bandage, or even incision and drainage, anti-infection and other symptomatic treatments in order to get cured. Because clinically there are two kinds of post-surgical subcutaneous effusion: one is seen in surface surgery, such as lymphatic fistula after radical or modified radical surgery for breast cancer, which is manifested as lymphatic effusion, and the treatment at this time is usually to be puncture suction, and then localized pressure bandage, and can be cured in 3-4 weeks in general. Secondly, it is seen in abdominal surgery incision, because the fat liquefaction caused by the thermal burn of electric knife leads to subcutaneous effusion, if it is not discharged in time, it may even be secondary to bacterial infection and abscess formation, so this time, we need to remove the suture and squeeze out the effusion, and if there is abscess formation, we even need to strengthen the treatment of anti-infective with antibiotics.