"Losing weight with Chili sauce is an irrelevant therapy," said Huang Wei, an attending dermatologist in the First People's Hospital. Dr. Huang believes that the reason why peppers can lose weight is because they contain capsaicin, which makes the skin red and hot, promotes blood circulation, and thus speeds up local metabolism. However, the weight loss products containing capsaicin in the market have poor permeability and cannot reach the subcutaneous fat layer. Even if they are useful, the effect cannot last more than twice. Because capsaicin will quickly excrete substance P, local skin will no longer sweat and fever, and it is impossible to lose weight by it. Blindly applying pepper paste may cause skin redness, allergy and even skin ulceration in severe cases.