When I saw the title to this thread, I thought you meant you were bitten by an actual bug at WDW.

That happened to me last week when I was lounging around the pool. We have no idea what kind of bug bit me (my money is on a spider), but the whole area around it on my leg swelled up a lot and itched like crazy. It wasn't pleasant.
Addonitis is a much more expensive bug but is way less itchy.