Pneumonia vaccine arm redness and swelling with hard lumps, can be treated with hot compresses, if there is pus, fluctuating sensation and other changes, then you need to consult a doctor in time. Pneumonia vaccine arm redness and swelling with hard lumps, belong to the scope of common vaccine adverse reactions. The general degree is relatively light, and there is a certain self-limiting, 3 to 5 days or so can basically be self-healing. At the same time, you can use hot towels to apply hot compresses to promote blood circulation to help the lumps subside. However, if the relief is not obvious after applying hot compresses, and even pus flow, fluctuating sensation and other aggravating manifestations, then the possibility of combined infection is greater. At this time, you need to consult a doctor in time, under the guidance of the doctor to carry out relevant examinations, such as blood routine, etc., to clarify the type of infection and then take penicillin and other antibiotics for treatment.