I Was Bitten By Some Kind Of Bug Mothers Day

I was bitten by some kind of bug mothers day on my arm it did not hurt it started itching but it looked like a bee sting a white raised circular spot with red dot in center.later it was the size of a quarter then by the next morning it was the size of a coke can lid and it's tender to touch but is really itchy.now it's like a rash with little bumps that get worse when I get hot or itch it.