Clinically, there are many causes of seborrheic dermatitis, and the etiology determined at present is not very clear. Clinically, many patients may be related to malassezia infection and bad living habits. Some patients can get obvious relief within a few months after external application and oral administration of drugs. But in clinic, there are also many patients with seborrheic dermatitis who can exist for a long time and present the characteristics of recurrent attacks. Therefore, it is not certain that the seborrheic dermatitis of the patient will be completely cured after treatment. Seborrheic dermatitis, like seborrheic dermatitis in infants, does have a certain self-healing tendency after 2-3 months, but adults do not have this self-healing tendency.