Colla Corii Asini cake put moldy is not recommended to eat, no matter how to deal with, it is difficult to ensure the eradication of pathogenic bacteria, consumption may be harmful to the body. The efficacy of Colla Corii Asini is to replenish blood and nourish yin, moisten dryness and stop bleeding. It is mainly used for blood deficiency and atrophy, dizziness and palpitations (rapid heartbeat, often accompanied by panic), muscle impotence, heartburn and insomnia, internal movement of deficiency wind, lung dryness and cough, coughing and haemoptysis with exertion, vomiting and urinating blood, blood in the stool and leakage of blood (excessive menstruation or more than a drip), and fetal leakage of pregnancy (small amount of bleeding from the vagina in the early stages of pregnancy). It is also used with caution in cases of spleen deficiency and loose stools. Colla Corii Asini is made from the skin of donkey after decoction, as an animal product, it has a certain shelf life, improper storage may lead to mold. Mold is caused by the reproduction of mold, mold as part of the fungus, its mycelium is very developed, even if the moldy part of the gum cake is removed, it is difficult to completely eradicate the reproduction of mold. The toxins produced by mold are harmful to human health, for example, aflatoxin can cause liver cancer and even life-threatening. The consumption of moldy Colla Corii Asini may lead to poisoning, carcinogenic and other adverse consequences, it is not recommended to treat before consumption.