Method: Bath formula: 10 grams of Ephedra, 10 grams of Cinnamomum, 10 grams of Qiangwu, 10 grams of Atractylodes, 10 grams of Angelica dahurica, 5 grams of Radix et Rhizoma, 10 grams of Patchouli, 10 grams of Angelica, 30 grams of Radix et Rhizoma, 30 grams of Radix et Rhizoma, 10 grams of Cicada, 10 grams of Phellodendron, 10 grams of Bupleurum, 10 grams of Psoralea, 10 grams of Bupleurum, etc. Boil water for external washing or bathing, once every other day, for 1 month. Indications: Pruritus, pruritus vulvae and skin boils in hemodialysis or non-dialysis patients with chronic renal failure. Effect: Clearing heat and detoxifying, dispelling wind and relieving itching to relieve skin itching, and promoting excretion of toxic substances from the skin. Principle: The overall effect of the medicinal bath refers to the use of drugs through the skin, orifices, acupuncture points and other parts of the direct absorption, into the meridians and blood channels, the transmission of the whole body and play its pharmacological effect. In recent years, people’s research on the mechanism of external treatment of traditional Chinese medicine baths has been intensifying, and it is believed that in addition to the direct entry of drugs into the blood circulation to exert their own pharmacological effects, there is also the role of adjusting the functions of various systems, tissues and organs and the immune function of the body.