Off to the allergist this morning with Geoff. She gave me a lecture about how allergies are hard to diagnose, and that ingestion and obvious reaction (hives, vomiting, etc.) is really the only way to diagnose an allergy.
Then she scratch-tested Geoff, but not the full panel, just a few things: milk, egg whites, egg yolks, and soy. And they were all negative!!!
I'm cautiously hopeful. Since he's never had any of those foods directly -- just through breastmilk -- he might not have been sensitized to them yet. It usually takes a couple of direct exposures to get sensitized to an allergen, and then the allergic reactions start escalating in scale.
So we'll probably try him on egg yolks this weekend -- I need to go and buy some organic eggs for him. Then next week, we'll try a tiny piece of cheese.