Bad Reaction

I don't know for sure what it is about the biting bugs this year, but my reaction to them is out of control.  I noticed a tiny bite on my leg with a red center one morning.  The next day, it started to burn and itch and grew incredibly huge.  At its worst, it was about the length of my hand from my wrist to the tips of fingers.  I tried really hard not to itch it but didn't always succeed.