Allergic to oatmeal?

It may not be the oats, there are a lot of ingredients in those flavored packets. It could be any of those. If something gives him a rash, don't feed it again; instead, talk to his pediatrician about allergy testing.

Does he have issues with other grain/wheat products? If not, it might not be the oatmeal itself, but something else in the flavored oatmeal.

I was allergic to oats. It could definitely be that. I was allergic to wheat too, but oats were much worse for me. I would stop the oats and see if the rash continues.

It could be all the other stuff in those prepackaged mixes. See if the rash goes away after you stop feeding it to him. Next try the non-prepackaged mixes.

I would HIGHLY suggest taking your child NOW to an allergist! It wasn't until my poor daughter was 3 1/2 years old and prescribed medication she ended up allergic to that her PCP at the time finally gave permission to go see another doctor other than himself. If I had known earlier, we could have helped her. She has many food allergies.

Please don't wait to get him tested!

Have you tried regular plain oatmeal and then mixing in some fruit? There's a lot of stuff in those little packets and I bet it's something else other than oatmeal. It's quick to cook the regular oatmeal in the microwave and then add some applesauce or other pureed fruit - if you keep the applesauce/fruit in the refrigerator it also helps cool the oatmeal when it comes out of the microwave hot.