After cupping, the color is red and black because the capillaries are different in different positions of people, and the expansion of capillaries will rupture the capillaries. The so-called toxin, in fact, is that the blood capillary under the skin breaks, and it turns black when it bleeds more. Cupping makes people feel comfortable not because of the so-called detoxification, but because the human body has the function of resisting endorphins emitted by the brain due to pain stimulation, so cupping actually has no benefit, and may also cause small-scale thrombosis. Pure hand tour, hope to adopt.