Gan Sui external application has the effect of subduing swelling and dispersing knots, and is the main treatment for carbuncles, swollen sores and poisons. Gan Sui is poisonous, cold in nature, bitter in taste, into the kidney, lungs, large intestine meridian, has the effect of expelling water, eliminating swelling and dispersing the effect of knot, clinically, the main treatment of distension of the chest and abdomen, edema, phlegm (water metabolism disorders in the formation of the pathological products of the water) accumulation of water, asthma and coughing, bowel movement is not conducive to carbuncle, swollen sores and poisons, and so on. Gan Sui can be taken internally or applied externally, the need to reduce the toxicity of internal use of concoctions, mostly made into pills, external appropriate amount of raw can be used. Clinicians use Gan Sui powder with water to apply externally to reduce swelling and dissipate lumps and treat localized redness, swelling, heat and pain of the skin. The adverse effects of the drug are not clear. It is contraindicated for people with deficiency of qi, yin injury, weakened spleen and stomach, and pregnant women. The application of Chinese medicine needs to be guided by a professional doctor and adjusted appropriately according to the patient’s own situation.