After the new crown to strengthen the needle arm pain, can be localized hot compresses, usually the symptoms can be gradually relieved. If the pain symptoms are serious, it can be treated with medication. After vaccination with the new crown booster shot, some people can have the symptom of arm pain, usually a slight pain in the injection localization, accompanied by redness, swelling, itching, etc., which belongs to the common local reaction after vaccination. Vaccinees do not need to worry, can pay attention to rest, local hot compresses, pain symptoms can be gradually relieved. A small number of people after vaccination arm local secondary infection, serious local redness, swelling and pain, this situation is recommended to timely medical treatment, local topical erythromycin ointment anti-infection, oral amoxicillin, ibuprofen and other drugs if necessary. If the local formation of large abscess, can be through local incision pus drainage treatment. In summary, localized mild pain after inoculation of new crown strengthening injection is normal, usually 1-3 days later can be recovered. Attention should be paid to keep the injection site clean and avoid rubbing the local area with hands repeatedly to avoid causing infection.