Cupping with bruising is normally a normal site, and the can mark can reflect the patient’s disease state. However, it may also be due to the long time of leaving the cupping, local tissue damage, taking anticoagulant drugs and other reasons. 1. Normal phenomenon: after cupping skin local appearance of different colors or forms of the can mark, can be to some extent that the disease, if the can mark was crimson, purple-black or red dan gua sha red point, touch feel slightly painful, and body heat, indicating that there is a heat toxicity evidence. If the can marks were purple or purple-black, no cholera and fever, indicating that there is a bruise evidence; If there is a slight itch or skin texture on the jar mark, it means that the dampness is heavier. If the can prints are purple and there are plaques, it means that there is cold and blood stasis evidence. 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 deficiency of qi and blood or yin deficiency and fire. 2. Cupping for a long time: the therapeutic effect of cupping is due to the negative pressure in the can pulling the tissues and muscles, stimulate local nerves, regulate vascular permeability to improve circulation, but if the can is left for too long, it will cause blood vessel damage and bleeding and subcutaneous bruising. 3. Local tissue damage: such as cupping parts of the existence of injury, injury induced by local inflammatory response, vascular injury, cupping at this time is more prone to vascular injury bleeding and bruising. 4. Taking anticoagulant drugs: patients who are taking anticoagulant drugs such as dabigatran etexilate and rivaroxaban for treatment needs are more prone to bruising due to weak coagulation function. If the phenomenon of cupping with bruises, you need to go to the regular hospital in a timely manner to clarify the cause, the doctor according to the situation of the individualized treatment plan.