We took Isaac in to an allergist for a skin prick test on basic allergens. They tested for all nuts, tree pollen, weed pollen, grass pollen, dog, and cat. The X on the upper right is the pure histamine control, which means anything bigger than that welt is what he's allergic to.
Turns out he's allergic to all of it. More specifically, peanuts, cashews, pistachios, trees, weeds, grass, dogs (a little), and cats (a little). Poor kid.
On the plus side, Samuel got tested too and came back negative for everything! Glad Collin passed his superior genetics on to at least one of our kids!