I had my booster 3 and a bit days ago and have a big red lump at the injection site. It's about 4cm in diameter and the skin is hot and hard. It's still getting worse each day. Is this normal or should I be worried? I have taken antihistamine, ibuprofen and painkillers and put savlon and ice on it, All jabs were Pfizer, arm was sore last time but nothing like this. (Have other side effects too... fever, tiredness and headache but they are improving now.)