@EvangelicalAboutButteredToast I also get badly bitten. Quite often, I have to have anti biotics.
If they swell up and get bigger, you should see a Dr on an emergency appointment or go to A & E as they can be dangerous.
This is what I have learnt to do over the years
I start with lightly marking up the bite with a pen. That's so I can see how much it grows.
A cold icepack on it and using hydrocortisone cream helps. If it continues to grow, you must see a Dr because if the infected area reaches a vein, you can end up with blood poisoning, which is very dangerous.
Also, elevating the infected area when you go to bed is useful. For a leg , put pillows underneath it. For arm bites, a sling
I was very close to being hospitalised and put on an IV drip of antibiotics some years ago, so please do take this seriously.
Because I haven't collapsed yet and stopped breathing, they won't give me an epi-pen.
Oh, and I take anti-histermenes twice a day all year found on GP advice as I can get bitten at any time