According to this characteristic of skin and the principle of external treatment of internal diseases in traditional Chinese medicine, Chinese medicine has long had the method of external application or external application of drugs to treat obesity. Modern medical circles have designed the method of transdermal absorption of drugs to lose weight by using the absorption function of skin. Drugs used in percutaneous absorption diet must have the characteristics of penetrating the skin and being absorbed by the body. Secondly, when using this method, the skin area should be large, otherwise the satisfactory effect can not be achieved. When the drug enters the blood circulation system through the skin, it first acts on the local target cells, that is, the drug receptors on the surface of fat cells, thus exerting the weight-reducing effect of the drug. Then the drug enters the blood circulation and is transported to the target cells far away from the administration site, thus achieving the effect of losing weight. Because the waist and abdomen are the hardest hit areas of obesity, there are more opportunities for percutaneous weight loss. It is worth reminding that although the drug transdermal absorption method is simple and less painful, if it is not combined with diet and exercise therapy, the effect will not be ideal. In other words, transdermal absorption of drugs should be one of the auxiliary means of weight loss and bodybuilding. (