Darkening of the skin at the place of cupping may be related to blood stasis or cold dampness, or it may be caused by cupping for too long. Cupping is a kind of Chinese medicine treatment, which has the function of dispelling wind and dispersing cold (dispelling wind and dispelling cold), promoting qi and activating blood circulation (promoting gas circulation to make the blood flow), and activating meridians and collaterals, etc. If the skin turns black after cupping, it may be caused by heavy cold-dampness, except the skin turns black. If the skin turns black after cupping, it may be caused by heavier cold and dampness. In addition to darkening of the skin, there may also be symptoms such as fear of cold, heaviness of the body and weakness of the limbs, which are usually more common. Some people who have pain in limbs or waist and back after exertion and exercise may also have blackened skin after cupping, which is due to localized blood stasis and obstruction, and purple-black ecchymosis or petechiae may appear at cupping site, accompanied by localized unfavorable activities, and aggravation of pain when moving, etc. In addition, blackened skin after cupping may be caused by heavy cold-dampness. In addition, the darkening of the skin at the cupping place may also be related to the feeling of wind, yin deficiency and fire (deficiency of yin and essence in the body, hyperactive fire), cupping for too long, etc. It is recommended to go to the hospital in a timely manner, to clarify the cause of cupping, and to be treated under the guidance of the doctor.