Hair dandruff is more, generally there are two cases, one is scalp chaff rash, may be caused by fungal infection, manifested as a large number of dandruff on the scalp hair; the other case is scalp psoriasis, a chronic inflammatory disease of the skin, manifested as a flaky distribution of erythema on the scalp, erythema surface with scales, scrape off the scales, you can see that the surface of the erythema is point-like hemorrhage. If it is dandruff caused by scalp furuncle, you can use compound ketoconazole shampoo to wash your hair, if it is dandruff caused by psoriasis on the head, you can use topical zinc pyrithione aerosol for treatment.