The method of eliminating hard lumps after vaccination is: 1. The molecular composition within the normal vaccine is relatively large, and many people will have hard lumps after injection, if the hard lumps are not very large and do not have symptoms such as redness, swelling, pain and itching, they can be observed and will slowly fade away on their own. 2. If there are symptoms of redness and swelling at the vaccine wound in addition to the hard lump, it means that there is a mild infection caused by inflammation, so you need to disinfect with alcohol 2-3 times before applying cold compresses to reduce swelling. Repeated use, should choose disposable items.