Blisters from fire cupping may indicate heavy dampness in the body, but it may also be due to skin burns, too long operation time and other factors. Heavy dampness in the body: it may be due to the weakness of one’s spleen qi, the spleen’s function of transportation (the spleen has the function of digesting food, absorbing food essence and water and transferring it to the whole body) is not normal, and the spleen is not healthy (the spleen’s transportation function is out of balance), resulting in phlegm and dampness in the body. At this time, fire cupping will cause the body’s dampness to disperse from the inside out and overflow, and blisters will be formed on the surface of the skin. Skin burns: Due to improper operation, the temperature of the mouth of the can is too high, and the contact with the skin during the cupping operation leads to localized skin burns. In this case, blisters will also appear on the surface skin. Therefore, it is recommended that fire cupping must be carried out under the standardized operation of a professional physician. Too long operation time: If the operation time of fire cupping is too long, it will also lead to local blisters, accompanied by local swelling, pain, and even bleeding and other symptoms. Therefore, it is recommended that the operation time should not be too long, and the local cupping time should be 5~15 minutes. In addition, it should be noted that if there is local bleeding and swelling after fire cupping, blisters and other phenomena, it is recommended not to deal with them on their own, and should consult the relevant therapist in a timely manner, and be dealt with by a professional physician. In addition, if there is a need for fire cupping, it is recommended to go to a professional medical institution to have the relevant treatment performed by a professional physician.