The invention relates to a medicament, in particular to a medicament for treating rash, which is prepared from various traditional Chinese medicines serving as raw materials, and mainly solves the problem that the conventional medicament for treating rash has effect of curing symptoms but not root causes, causes recrudescence, has large side effects, is easy to generate medicament resistance, has poor curative effect and the like. The medicament consists of pseudoginseng root, figwort root, great burdock achene, dendrobium, coastal glehnia root, Chinese dwarf cherry seed, dwarf lilyturf tuber, fragrant solomonseal rhizome, bupleurum, baical skullcap root, Chinese gentian, natural indigo, talcpowder, asiatic moonseed rhizome, blackberrykiky rhizome, rehmannia, cortex moutan, green tangerine peel, cicada shell, hawthorn, stiff silkworm, Mongolian snakegourd root, indigowoad leaf, liquorice, Chinese date and ginger according to a certain ratio. The medicament is prepared from the traditional Chinese medicines to treat and condition the disease, treats both the symptoms and the root causes, and has the advantages of small side effect, no medicament resistance after long-term administration, no recrudescence, obvious curative effect and high cure rate.