Scalp itchy dandruff is considered to be a long time without washing hair, seborrheic dermatitis of the scalp, psoriasis, etc., according to the specific cause of the disease, choose the appropriate ointment to apply. 1. Long time not washing hair: dandruff is the product of scalp metabolism, if you don’t wash your hair for a long time, dandruff will accumulate more, and cause itchy scalp, this situation does not need to use ointment, only need to use good anti-dandruff effect of shampoo to wash your hair. 2. Seborrheic dermatitis of the scalp: this disease will appear erythema, with greasy flaking, accompanied by mild itching, you can use selenium sulfide shampoo to wash your hair, you can also use sulfur and salicylic acid preparations. 3. psoriasis: psoriasis if involved in the scalp will appear thicker scales, accompanied by itching, if the area is not large, you can apply tretinoin cream, mometasone furoate cream, if the effect is not obvious, you can also apply tazarotene gel, carbotenoids ointment, tacrolimus ointment and so on. Itchy scalp dandruff, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, to give targeted treatment or treatment. All of the above drugs should be used in accordance with medical advice.