Vaccination arm swelling does not go away, is an adverse reaction after vaccination, you can use hot compresses, magnesium sulfate wet compresses and other measures to alleviate the symptoms, if necessary, you can use ibuprofen and other non-steroidal drugs for treatment. 1. Hot compresses: for the swelling after vaccination continues to be unable to eliminate the situation, can be localized hot compresses, each time the use of hot towels for about 15-20min, twice a day, to promote the absorption of inflammation. 2. Magnesium sulfate wet compress: If the swelling is serious, magnesium sulfate can be used for local wet compresses, magnesium sulfate can be soaked gauze, covered in the swollen parts, to promote swelling. 3. Medication: If there is still severe swelling and pain after taking the above measures, non-steroidal anti-inflammatory drugs such as ibuprofen and acetaminophen can be taken to promote the absorption of inflammation. Patients are advised to keep the local skin clean and dry, pay attention to light diet, and avoid excessive squeezing of the local skin. If the swelling is serious, consult a doctor in time and avoid self-medication.