The hard lumps at the injection site after the vaccination are probably due to local infection and then muscle hardness, which can be relieved by applying hot towels or magnesium sulfate. If the local hard lump produces pain most likely when the symptoms of infection have not been eliminated, timely treatment with anti-inflammatory drugs, such as oral cephalexin granules, erythromycin granules, etc.. You can also use antipyretic and analgesic drugs as appropriate, such as ibuprofen granules, which are very helpful in relieving the inflammation in the hard lump area. Local redness and swelling can also be applied to the skin surface with safflower oil or antispasmodic and analgesic tincture, which can play the effect of activating blood circulation and removing blood stasis.