Qingdai powder can be taken internally or applied externally. Qingdai powder is a dried powder made from the leaves or stems of horse blue, polygonum or woad, which can be taken internally or applied externally. Because of the hard to dissolve in water, internal use of qingdai, generally take qingdai as a powder, or into the pill to take; qingdai external use, you can take the appropriate amount of external application on the affected area. Qing Dai has the efficacy of clearing heat and removing toxins (removing heat and toxins from the body), cooling blood and eliminating spots, clearing liver and diarrhea (removing liver fire), and fixing panic, and can be used to treat warm poison and spots (warm heat and toxins invade the human body resulting in spots and plaques on the skin), blood-heat and epistaxis (blood-heat causing vomiting of blood and nosebleed), sore throat and mouth sores, coughing and chest pain, blood in sputum, and pediatric eclampsia and other illnesses. It should be noted that patients with cold stomach should be cautious of using Qingdai Powder, and the adverse reactions and contraindications of taking Qingdai Powder are not clear. If you need to use qingdai powder, please under the guidance of a physician.