Cupping blisters may be too long, too high temperature, thin skin horny layer. 1. Staying too long: cupping is the use of negative pressure principle of subcutaneous tissue, muscle inhalation tank, pulling muscle tissue to make it congested, increase tissue permeability, so stay too long will lead to subcutaneous tissue fluid leakage to the skin to form blisters. 2. Too high a temperature: when the flash can operation, the temperature of the can may be too high, which is easy to burn the skin resulting in cell destruction, tissue fluid into the skin to form blisters. 3. Thin skin stratum corneum: some people’s skin stratum corneum is thin, skin sensitivity, more vulnerable to external stimuli damage, this time cupping is more likely to blisters. If cupping out of blisters, need to go to the hospital in time, by the doctor according to the situation, do not pick blisters, so as not to cause infection, and need to pay attention to, cupping operation need to be operated by a professional doctor, do not operate on their own treatment.