Had my flu jab yesterday. Get it every year and normally feel a bit feverish and rubbish for a few hours but nothing major. Obviously always get a sore arm. This time I've felt fine apart from a really painful arm, when I've checked it this afternoon it's got a big red rash all the way around, it's also got a big hard lump about 10cm all the way around. It's now getting really itchy and warm to touch. I'm hoping it's just where it's healing but has anyone else had this?