Itchy scalp after washing hair may be considered as an allergy to shampoo or shampoos, causing contact dermatitis or eczema. In terms of clinical treatment, those with more intense itching can take oral antihistamines such as epinastine capsules and lupatadine fumarate tablets. If the effect is not satisfactory, glucocorticoids can also be used under the guidance of a doctor for the purpose of anti-allergic, anti-itch and immunosuppressive treatment. Trimethoprim ointment and hydrocortisone butyrate ointment can be applied topically. If small pustules occur, topical application of compound polymyxin B ointment and mupirocin ointment can be used for treatment. Avoid alcohol and spicy and irritating foods during the treatment period.