The reason why dandruff can’t be washed off may be related to seborrheic dermatitis, you can improve the fungal examination under the guidance of the doctor, if necessary, combined with the doctor’s advice to give targeted drug treatment. Dandruff more can use anti-dandruff shampoo, can effectively reduce dandruff. If the dandruff is still not improved, you need to go to the dermatology department of the hospital for a fungal examination to find out if the excessive dandruff is related to seborrheic dermatitis. If it is related to seborrheic dermatitis, under the guidance of the doctor can be used containing selenium disulfide lotion or ketoconazole lotion to improve dandruff can not be washed off the situation. Usually pay attention to the care of the head, do not often dyeing and perming hair, choose the right toiletries. If necessary, go to the dermatology department of the hospital, for the cause of the disease, under the guidance of the doctor to give the appropriate drug treatment.