Cupping blisters is a relatively common situation, under normal circumstances, the liquid in the blisters for the transparent clear liquid, if there is yellow water may be the following cases. 1. Skin burns or cupping time is too long: If the blisters appear in cupping as yellow liquid, it may be because the operator does not standardize the operation when cupping, the flame scalded the operator’s skin or the cupping time is too long, resulting in the skin localized in the negative pressure state for a long time and make the skin damage. 2. Local skin infection: if the patient has broken, infected or ulcerated local skin before cupping, yellow water blisters will appear when cupping. It is mainly caused by local tissue infection and pus, the operator needs to ask carefully before cupping, avoiding cupping in the broken skin. 3. Dampness and heat in the body: if the blisters have yellow water, it may also suggest that there is dampness and heat in the patient’s body, usually accompanied by bitter mouth, loose stools (loose feces), epigastric (abdominal) plagiarism and other symptoms of dampness and heat, which need to be treated systematically. Cupping blisters with yellow water is mainly caused by the above three conditions, either one of which need to be timely feedback to the doctor for treatment, so as not to delay the condition.