Peanut Butter

I was getting out some peanut butter for the kids' snack today and Seth reached out and grabbed the container really quick. Then he got his hand to his mouth while I was getting a cloth. I washed it off his hands and face right away and within a couple of minutes, he broke out all over! But he hasn't thrown up or swollen at all. Still that SUCKS! We eat so much peanut butter at our house! Why does he keep having reactions to all the things that we rely on heavily for Corbin? :(