Itchy hair just after washing may be the existence of seborrheic dermatitis, may also be caused by allergies, after diagnosis, should use topical as well as oral medication for treatment. 1. Seborrheic dermatitis: may be related to fungal infections, after diagnosis can be applied to antifungal drugs for treatment, such as terbinafine hydrochloride cream, clotrimazole cream, etc., serious cases should be combined with oral antifungal drugs, such as itraconazole and so on. 2. Allergy: For itchy scalp caused by allergy, topical glycerite lotion can be used to improve, but also with oral anti-allergy drugs, such as cetirizine and loratadine. During the treatment period, follow the doctor’s instructions, safe and reasonable use of drugs, and to keep the scalp area clean, avoid excessive scratching, light diet, avoid drinking alcohol.