Pityriasis rosea is an acute inflammatory skin disease, the typical lesion is a rose-colored rash covered with collar-like bran-like scales, the course of the disease is self-limiting. The etiology is unknown, but most believe it is related to viral (e.g., Coxsackie group B virus) infection. Cellular immune response may be involved in the development of this disease. The disease affects mostly young and middle-aged people, with a high incidence in spring and autumn. The initial lesion is an isolated rose-colored light red spot, which can rapidly expand to 2-3 cm in diameter, covered with thin scales, called heraldpatch or motherpatch, and can occur anywhere on the trunk and proximal extremities. 1cm in diameter, often oval in shape, with thin scales with inwardly shaped free margins and long axis parallel to the skin lines. It is often accompanied by varying degrees of pruritus. The disease is self-limiting, the duration of the disease is generally 4 to 8 weeks, there are also months or even years do not heal, but generally does not recur after healing. The disease is generally not difficult to diagnose based on typical clinical manifestations. The disease needs to be differentiated from psoriasis, seborrheic dermatitis, lichen planus, second-stage syphilis rash and drug rash. The disease is self-limiting and can be treated with heat-clearing and detoxifying herbs. The main purpose of treatment is to reduce symptoms and shorten the course of the disease. Topical glucocorticoids can be applied topically. For itching, oral antihistamines and glycopyrrolate can be taken. 30-60mg/d of oral prednisone can be given to those with severe or long duration of disease.