Is there a way to tell the difference between a mosquito bite and a spider bite by looking at the bite itself?

I didn’t see the bug that bit me. I was asleep and woke up with two bites. Just wondering if there is a way to tell which sick little bugger is responsible. I’m going to hunt it down and mess that fool up. I might hesitate when I see it if it’s a spider, but I’ll still kick its ass. Flush that sucker. I’m rambling..