There is no peak problem of pityriasis rosea, and the progress of its course is a gradual development process. The cause of pityriasis rosea is not yet clear, some can show a certain seasonality, may be related to resistance decline and viral and bacterial infection. This disease first appears mother spot, in the form of round or oval erythema of nail cover size, erythema surface has scales, flaking. Pityriasis rosea generally appears in 1-2 weeks after the appearance of the mother spot and the proximal end of the trunk and limbs successively appearing in generalized batches of lesions, the morphology of such lesions is basically the same as that of the mother spot, but it is smaller compared with the mother spot, and it is called secondary spot. Pityriasis rosea has certain self-healing, when there is no new rash increase, the existing rash color lightens, the flaking reduces, means the pityriasis rosea enters the recovery period, usually takes about 6-8 weeks, if after the medication, then can effectively shorten its course. The prognosis of this disease is better, usually will not leave other sequelae, the patient need not worry too much.