Plum blossom rash refers to pityriasis rosea in medical terms. Pityriasis rosea may be related to infection, immune abnormality and other factors, and the patient will have localized patches covered with scales. The prognosis is good after general treatment, medication and other treatments. Pityriasis rosea is a common self-limiting inflammatory skin disease, the cause of which may be related to infection, immune abnormality and other factors, and mental factors, drugs and other causes may also induce the disease. Patients will appear localized round patches, covered with scales, rose red, may be accompanied by itching. Patients should pay attention to personal hygiene and keep the skin clean in daily life. Pityriasis rosea can usually subside on its own, so treatment is generally not needed; for patients with obvious symptoms, topical glucocorticoid drugs, such as betamethasone, hydrocortisone, etc., can help reduce swelling and relieve itching. Drugs need to be used in accordance with medical advice. If you suffer from pityriasis rosea, it is recommended to go to regular hospitals for examination, and cooperate with doctors to standardize treatment.