Cang Er is used as a decoction in water or pounded juice, boiled paste or in pills and powder, and can also be used externally. Cang Er’s taste is bitter, pungent, cold, it is a traditional Chinese medicine, there are wind, heat, detoxification and insecticidal effect; the role of the treatment of wet paralysis contracture, eye star cataracts, scabies hemorrhoids leakage, on the skin itchy, rash, dizziness and so on also have a role; Cang Er in the use of decoction can be taken with water or pounded juice, paste, or into the pills, bulk, can be pounded compresses, burnt storing sex research powder or decoction of wash. Cang Er adverse reactions are not yet clear, gas deficiency and blood deficiency patients should not be used; attention should not be overdosed. If you need to use medication, you need to use under the guidance of a traditional Chinese medicine practitioner to identify the evidence, not self-medication, to avoid adverse effects on the body.