Help me please!!!!!!!!!!!!!!!!!!!!!!!!…

okay, so i was outside sweeping away a sugar ant pile because they have been all over my house and my broom is always outside. so im guessing i got bit by something, i think a spider, hiding in the hole at the top where you can hang it somewhere. the bite is a small blister(just a little over a half an inch wide) and its red around the edges. please tell me what bug could have bitten me! i was bitten on my thumb 10 hours ago, now my whole arm is aching. please help):