The purple color of skin after cupping suggests that there is cold-dampness and blood stasis in the body, and it may also be caused by the obstruction of local blood flow due to prolonged cupping time. Cupping is a common therapeutic technique used in clinical practice, which is a method of preventing and treating diseases by using a can as an operating tool, and utilizing burning and suction methods to make the can adsorb on the body surface. If the skin at the cupping site appears purple after the cupping operation, it generally suggests that there is cold-dampness and blood stasis in the body, or it may be because the cupping time is too long. However, the color of the skin after cupping should not be judged only by the color of the cupped skin, but should also be combined with other symptoms of the patient. If there is cold-dampness in the patient, there may be coldness (fear of cold, cold limbs), abdominal distension, diarrhea or swelling. For patients with blood stasis, localized fixed tingling, refusal to be pressed, purple hematoma, hardness and fullness of the abdomen, etc. can also be seen. If cupping treatment is needed, it is recommended to go to a regular hospital.