DS has randomly had a red rash break out around his mouth this week after eating certain things, but all things he has had before. We had pancakes on Sunday using the same mix & syrup as before, and he got the rash and then again on Monday with pancake leftovers. He had BBQ sauce at his Gram's this week and got a rash. It is not the same BBQ sauce that we have at home, but is still BBQ sauce. And then today he was having Chex & Cinnamon Chex for breakfast and got a rash as well. He had both of these yesterday without a problem.

I am not sure if I should be really concerned or what to think. The rash goes away after about 20 minutes but I am not sure what exactly triggers it in these foods or if it could get worse.
Any ideas?