The blood coagulation function during menstrual period is not good, and the body's immunity is also low. If the operation is prone to bleeding or infection, the recovery will be slow. I suggest you wait until your period is clean before you have surgery. Double eyelid surgery's operation during menstruation is risky. In severe cases, it will lead to uterine bleeding, so the majority of female patients must avoid double eyelid surgery during menstruation. Under normal circumstances, a blood clot will be formed on the wound surface of cosmetic surgery, but the precursor activator of plasminogen in women's blood will increase during menstruation, reaching the maximum value, which will destroy the blood clot, so there will be bleeding and bacteria are likely to invade.