I know I already said this, but Zyrtec has been life changing for us. DS has moderate to severe eczema all over his body. I realize this doesn't actually determine what he may be allergic to, but it at least gives him relief.

Unrelated, but I also wonder if it's something at daycare (a detergent or perfume or something) because since the school year ended his skin has been looking better and he's been going to daycare only part time. Around this same time he also started using Zyrtec.