After four or five days of tetanus shot, the itch around the eye of the needle may be caused by the allergic reaction caused by the vaccine and the incomplete absorption of the vaccine ingredients. 1. Vaccine-induced allergic reaction: it may be due to local moisture, irritation or local allergy caused by the ingredients in the vaccine, which will lead to the phenomenon of itchiness around the injection site four or five days after the tetanus shot. 2. Vaccine components are not fully absorbed: the total itch around the injection site is the reaction of the drug absorption process, if the drug is not fully absorbed, the phenomenon of total itch around the eye of the needle after four or five days of tetanus injection may also occur. If the itch around the eye of the needle after tetanus injection for four or five days, you should go to the hospital in time for examination, to clarify the cause of the disease, and actively treat it.