We have no known allergies in our family. But today, Chicken had a strange reaction to...something. She was rubbing her eyes, and suddenly she had swollen, itchy-looking welts all around her eyes. It was obviously a contact reaction to something she had on her hands. The only thing I could think of that was possibly different (ie. she may not have had it before) is macadamia nuts. I had a packet of them and she ate a few. Does this sound like an allergic reaction? Does it sound like something I need to investigate further? How would I do that?