The rubella and eczema treated by Xiaofeng Powder are caused by the evil of rheumatism or wind-heat invading the human body, soaking in the blood, not letting loose inside, not penetrating outside, and being depressed between the skin, so the skin is itchy, the rash is excellent and red, or the body fluid overflows after being scratched. Treatment should be based on dispelling wind, supplemented by heat-clearing and dehumidification. Itching comes from the wind, and the wind must be dispelled first to stop itching. Therefore, the pungent smell of Schizonepeta, Saposhnikovia divaricata, Arctium lappa and cicada slough is dispersed thoroughly, and the wind is dispelled to dispel evil spirits, so that the itching will stop, and * * * is the monarch medicine. Compatibility with Atractylodes lancea for expelling wind and drying dampness, Sophora flavescens for clearing heat and drying dampness, and Akebia manshuriensis for promoting diuresis are designed for dampness evil; Gypsum and Anemarrhena asphodeloides are used for clearing away heat and purging fire, which are all minister drugs. However, wind and heat are depressed inside, which is easy to consume yin and blood; Damp-heat immersion is easy to block blood vessels, so Angelica sinensis, Radix Rehmanniae and Semen Hemerocallis are used to nourish blood and promote blood circulation, and the meaning of "treating wind first, treating blood, and blood circulation will extinguish itself" is used as an assistant. Glycyrrhiza uralensis Fisch. clears away heat and toxic materials, and mediates herbs.