After cupping, due to poor control of the strength of the cupping, especially poor control of the cupping time, it is very easy to blister. If the amount of blisters is very small, you can ignore it and it will naturally subside and be absorbed. If the blister is large, as big as a hairy bean or a fava bean, this blister definitely needs to be picked through. First use a sterile needle to pierce the epidermis of the blister, and then use sterile cotton balls to absorb the tissue fluid inside, and then put a thin layer of gauze on the outside, mainly to let it ventilate, avoid wear and tear, friction, do not rub the injured skin again, to keep it dry, there should be about a week to crust and improve.