Hello, double eyelid surgery is a simple plastic surgery for plastic surgery in medicine. Although it is simple, it requires the surgeon to have rich operating experience. There are many blood vessels and nerves in the eye cortex to protect eyelid lift and muscle contraction. When people are doing double eyelid plastic surgery, if it is not handled properly, there will be a certain amount of congestion in the wound area and accumulated in the lower part of the eyes. At this time, black bags under the eyes will appear, or edema will occur. Under normal circumstances, people will have a certain degree of swelling after finishing double eyelid surgery, but they will disappear quickly after a few days of recovery, so don't worry too much.