Ear piercing is not allowed during menstruation, as it will cause more blood to come out locally during the piercing. In addition, the decrease in body resistance during menstruation will increase the chance of wound infection, i.e., redness and abscesses around the ear piercing, which is not conducive to wound healing. Generally, ear piercing should be performed only 3-5 days after menstruation, and it should be done under aseptic operation to ensure the success of the operation and to reduce the chances of infection and scar formation. Therefore, it is also necessary to choose the right time for the ear-opening and post-operative anti-infection treatment, such as antibiotics, such as cefprozil, etc.