Alisha, I am not a nurse, but I do know a little bit about spider bites (unfortunately). You did the right thing by marking it. Everyone reacts differently even to the same kind of bite and the tissue where the bite occurs makes a big difference too. Fatty tissue usually has a worse reaction. When I was bit, the center of the bite turned black and died and flaked away leaving a hole in my knee. My bite mark was small, but I had the red streaks veining out from the bite and that warranted medical attention. So my advice is if it gets bigger than a quarter or he gets the streaking or changes in mood he should see a doctor. Otherwise, I'd just watch it for sudden changes.
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