The appearance of a blackish purple color after cupping is a frequent phenomenon among cupping, which is a very normal treatment phenomenon. The reason why cupping appears black and purple is because the disease is usually due to the invasion of wind and cold into the body and the formation of lesions. After the formation of stagnant blood, cupping therapy will pull the stagnant blood, that is, the blood in the blood vessels to the subcutaneous, these blood itself is oxygen-deficient blood, so its color is darker, the color will not be bright red bright red, but dark purple or black. This proves that the stagnant blood in the body has been plucked to the surface of the body, a process of transformation in the good direction.