Seborrheic dermatitis, also known as seborrheic eczema, is a symptom of excessive proliferation of pityrosporum ovatum due to poor rest and lack of sleep and decreased immunity. There may be redness, itching or desquamation of the skin, and even hair loss in severe cases. In the treatment of this disease, it is suggested that oral vitamin B should be used to nourish nerves, improve sleep and enhance immunity. External use of naftifine ketoconazole cream or tacrolimus cream, combined with hyaluronic acid, can effectively treat this disease while resisting inflammation and killing local fungal infections, moisturizing and repairing skin barrier function. But there is no cure, and the recurrence can only be reduced through the improvement of autoimmune.