Spicy Eggs - uh oh!

A few weeks ago I posted about Owen tasting some of the spicy eggs my dad makes and being willing to eat those over plain scrambled eggs. Well this past weekend my dad was down for another visit, and this time made an extra large plate of spicy eggs for the boys and they gobbled them all up. After breakfast we put them down for their morning nap, and afterward found Owen with red splotchy patches all over his face and body! His ears were larger than normal, puffy, and bright red.  Luckily his breathing was normal and he was acting completely fine, so we didn't need to take him to see a doctor - the symptoms subsided within a few hours.  We're not sure if it was the eggs, onions, or maybe the larger than normal quantity of one of these that triggered the reaction.  Owen has had eggs before and been fine, including the egg needed to make pancakes today, so I'm thinking maybe the onions were the culprit.  As Owen would say (his favorite expression lately) - uh oh!