The cause of pityriasis rosea has two kinds of theories: one is the virus infection, the other is the autoimmune reaction. The manifestation often appears a piece of “mother spot” at the beginning of the disease, about the nail cover big, even can reach the egg big, 1~2 weeks later can appear in the trunk, extremities successively the same damage of different sizes, called “child spot”, generally does not appear in the head face and the distant part of the extremities. The rash is mostly on the side of the chest, and its long axis is consistent with the skin texture, and the center of white flakes is free and the edge is attached. Most people are asymptomatic, and the itchiness at the rash may or may not be mild or severe, while individual patients have low fever, headache, general discomfort, sore throat and arthralgia. The rash may heal on its own after about 6-8 weeks, and may be prolonged for more than half a year in some patients. The rash does not leave any trace after it subsides. Do not use hot water to wash during the illness, and eat a light diet. In order to reduce the symptoms and shorten the course of the disease, the whole warehouse can be used ultraviolet light therapy and oral compound Qing Dai capsules, oral anti-itch drugs, etc.