Cupping is mainly used to accelerate blood circulation and promote metabolism through mechanical stimulation, negative pressure and warmth, thus playing a medical and health care role. Cupping bruising is generally a normal phenomenon, 3-5 days to subside, the skin local appearance of different colors of the can mark can be to some extent, but not the deeper the effect of bruising the better. If the can marks were crimson, purple-black or red spots of gua sha, touching feel slightly painful, and body heat, indicating that there is heat toxicity evidence. If the pot mark was purple red or purple black, no cholera and fever, indicating that there is a bruise; if the pot mark appears slightly itchy or skin phenomenon, indicating that the dampness is heavier. If the jar prints are purple and have plaques, it means that there is cold condensation and blood stasis. If the cupping marks are scattered purple dots, indicating that there is stagnation of qi and blood stasis; if the cupping marks are bright red and colorful, indicating that there is a deficiency of qi and blood or a deficiency of yin and fire evidence. However, it should be noted that the cupping time should not be too long, the negative pressure should not be excessive, otherwise it will lead to blood vessel damage, blood overflow out of the blood vessels causing serious subcutaneous bruising. If serious skin bruising occurs, it is necessary to go to a regular hospital in a timely manner to clarify the cause, and the doctor will issue an individualized treatment plan according to the situation.