For seborrheic dermatitis of scalp, it is best to use a shampoo containing ketoconazole when using external medicine, such as ketoconazole lotion or selenium disulfide to wash the effusion. Commonly used drugs for external use mainly include mixed preparations of glucocorticoids, such as compound miconazole cream, compound econazole cream and trimethoprim cream, etc. If there is erosion or exudation, zinc oxide oil or zinc oxide paste can be given for external use. At the same time, the inducement must be removed to avoid nervousness and anxiety, and spicy food should not be eaten in the diet. If there is a lack of vitamin B, it needs to be supplemented in time, and at the same time, don't drink alcohol, take vitamin B zinc preparation orally, and severe itching can be treated with topical drugs. Not all patients with seborrheic dermatitis on the scalp use the same topical medicine, and the most suitable topical medicine depends on the patient's specific situation.