Red, itchy scalp is often considered the following diseases: first, eczema. Second, seborrheic dermatitis. Third, psoriasis of the scalp. Fourth, ringworm of the head. The first three diseases can take oral anti-allergic anti-itch drugs, such as levocetirizine hydrochloride tablets, imipramine extended-release tablets, desloratadine tablets, fexofenadine hydrochloride tablets. Topical hormonal creams such as hydrocortisone butyrate ointment, fluticasone propionate ointment, and Denide cream can be used. If seborrheic dermatitis and psoriasis with heavy scalp flaking, you can wash your hair with topical selenium disulfide lotion. If the scalp is red and itchy caused by ringworm, you should use topical antifungal medications such as naftifine ketoconazole cream. It is also important to avoid spicy and irritating foods and alcohol.