Itchy scalp after dyeing hair, consider with irritation, allergy related. It is recommended to wash off the residual shampoo, give anti-allergy, glucocorticoid drugs or go to the hospital for treatment if necessary. Itchy scalp after hair coloring, consider with the hair dye on the scalp caused by the stimulation. Or itself is an allergic body, allergic to hair dye ingredients, can cause the above symptoms. 1. General treatment: If it is clear that the allergy is caused by the hair dye, it is recommended that the scalp and hair be washed repeatedly with water to rinse off the residue of the hair dye and avoid further aggravation of the allergic symptoms. 2. Drug treatment: allergic reaction is mild, such as scalp itching, erythema, pimples, etc., you can take oral antihistamines, such as loratadine, olopatadine hydrochloride, cetirizine hydrochloride, etc., can relieve itching skin. Topical glucocorticoid drugs, such as hydrocortisone butyrate, mometasone furoate, etc., can quickly relieve the inflammatory reaction. 3. Go to the hospital for treatment: If it is a widespread allergic reaction, such as the appearance of obvious edema, head, face, trunk and limbs with a rash, it is recommended to go to the hospital in time. Appropriate systemic application of corticosteroids, such as betamethasone, prednisolone orally or through intravenous administration of treatment. The symptoms of allergy after hair coloring, it is recommended to try not to dye hair in the future to avoid triggering adverse reactions. If the symptoms are obvious, it is recommended to consult a doctor in time to avoid delaying the condition, and the above drugs are used according to the doctor’s instructions.