Blisters from cupping may be in the drainage of dampness, or may be caused by leaving the cupping for too long, burns and other factors. Cupping can stimulate the acupoints, accelerate the speed of meridian operation, dampness heavy patients cupping treatment, due to dampness patients meridian operation is not smooth, in the process of dampness out of the body, may leave blisters in the cupping site. But cupping blisters may also be caused by leaving the can for too long, by the effect of negative pressure inside the can, which will lead to small blood vessels rupture, making the tissue fluid seepage, will also form blisters. If the temperature inside the can is too high, it will burn the skin and blisters will be formed. It is recommended that patients go to the regular place of cupping, not self-cupping, blisters should be treated in a regular hospital.