Does it have to wait until the sand is scraped before it fades? Why?

Because scraping therapy will produce some "blood stasis", so after scraping once, you have to wait for a period of time, usually about five to seven days, and then do the second time. Bubbing's skin is red and looks a little scary. In fact, no matter how red it is, don't worry, because it is harmless to the skin. The color of erythema usually reflects the severity of the disease. The more serious the illness, the more "prickly heat" and the darker the color. If the illness is mild, the less "prickly heat" there is, the lighter the color is. Under normal circumstances, the "congestion" on the skin will gradually subside within 3-5 days and return to normal later than 1 week, which will not only damage the skin, but also strengthen the local blood circulation because of this method of promoting blood circulation and removing blood stasis, making the skin healthier and more beautiful than before.