Haylee's Crazy Allergy

Haylee has been randomly breaking out for about a year now with RANDOM foods.  I can't figure out what it is.  I thought it was syrup because it happened several times after eating pancakes so we started making our own syrup and she was fine. 
It has also happened with SOME ketchups, BBQ sauce, and today it happened with Ranch dressing!!  I think it maybe some type of corn syrup/perservitive.  I don't know what else to think. 

My expressive little girl!!!

She doesn't seem to be bothered by it.  It's a little warm but not HOT, and eventually goes away on it's own after about an hour!!  WEIRD, huh?

Anybody ever experience this???