When seborrheic dermatitis appears on the scalp, first of all, you need to adjust your diet to avoid greasy, spicy, irritating foods and desserts, which can easily lead to increased sebum secretion and aggravate seborrheic dermatitis, and at the same time, you must not scratch, otherwise infection symptoms can easily occur. If the itching is obvious, you can give antihistamine drugs, and at the same time you can take oral vitamin B to reduce the symptoms, topical topical lotion, you can use selenium disulfide lotion, ketoconazole lotion, etc. for treatment, you can use it twice a week, when you use it, you need to stay in the scalp for 5-10 minutes and then rinse it off, at the same time, the water temperature for washing hair must not be too high, otherwise it is easy to stimulate the scalp. For limited itching with obvious patches, you can give topical treatment with a compound topical cream, such as trimethoprim cream or pirenzone cream.