The dried whole herb of Lung Kwai in water may have the effect of clearing heat and reducing swelling, but the water may not be able to completely precipitate the active ingredients of Lung Kwai, plus only a single herb is used, so the efficacy is limited. Lung Kwai is the whole grass of the plant Lung Kwai of the family Solanaceae. It is bitter in taste and cold in nature, with the effects of clearing heat and removing toxins (removing heat and toxicity from the body), activating blood circulation and subduing swellings. The main treatment for boils (mostly in the limbs or facial sores, shape small root base deep, such as nails as hard), carbuncle, canker sores, dengtoxin (acute infectious diseases, visible skin red like paint), bruises and sprains, coughs, edema. In order to make better use of the medicinal effects of Longquan, it is recommended to use it under the guidance of a traditional Chinese medicine practitioner to identify the symptoms, and unauthorized use of the drug may result in adverse consequences.