I Was Outside And I Was Stung Or Bitten Twice

I was outside and I was stung or bitten twice on my left foot not even an inch apart and now my the area around where (softball diameter) I was stung is swollen tender and red. The sting/bite is yellow with a dark red ring that fades into my skin color the closer to the edge of the swollen area. I have no idea what kind of insect it was since I panic a flung it off