Yep, he's allergic.

So Oliver ate [on accident] something he was allergic to for the first time.  I bought him some barley teething biscuits - read the ingredient label.  For whatever reason my eyes skipped right over the "contains milk" statement.  He ate the cracker and a few minutes later he was screaming with welts all over his face.  I thought he had a barley allergy at first until I reread the food package.  Oops.  Mother of the Year.  Well, we now know he is definitely allergic to baked milk.  We gave Benadryl at night and Zyrtec during the day for a few days until the reaction finally healed.  This was Oliver the next few days after the reaction when the welts were gone....from eating a cracker.