The third injection of vaccine allergy itching, you can use anti-inflammatory, anti-allergy drugs. The third injection of vaccine systemic allergy appeared itching symptoms are more serious, the first choice of drug treatment, you can use antihistamines, such as cetirizine, loratadine, ibastine, etc., if the rash is more serious, the itching symptoms are obvious, you can add glucocorticoids, such as prednisone for the second line of anti-allergy treatment, in addition to the emergence of severe allergic reactions, such as laryngeal edema, you can choose adrenaline for the Active resuscitation. Medical measures should be taken under the supervision of a physician. The symptoms of allergic itching after vaccination can also use topical drugs, such as external application of hydrocortisone butyrate, mometasone furoate ointment, halometasone and other drugs, which can play a certain effect, and pay attention to the protection of the skin clean. After the vaccine skin allergic reaction, it is recommended to go to the hospital, closely observe the changes in the condition, specific medication is recommended under the guidance of the doctor.