We finally were able to get in to see the allergist who tested Josiah for the regular food allergies: dairy, wheat, soy, egg, fish, and peanuts. Josiah came out negative for all of them. The doc seemed to notice that Josiah was getting new hives mostly near/around where he was being touched. So he did a pen test to see if he had something called Dermatographism. The area where the doc used the pen to scratch his skin was raised in a few minutes. In neuro-typical people, the skin would just turn red, but would not raise itself into a welt. Doc's theory seemed plausible, but we are not convinced that this is what caused Josiah's hives.
Bill did look into it a little more on Wikipedia and found that heat can sometimes cause hives, which makes a little more sense b/c Josiah often gets heat rashes. Of course, we're just totally speculating here, so I guess only time will tell if we can try and find a correlation if/when he breaks out the next time. We are grateful though that it would seem he doesn't have any food allergies at this point. =)
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