I'm not totally sure and am no doctor, but I have a similar experience with some spicy crisps. I ended up with a rash, like hives as you describe, on my hand and it swelled up. Have also had it on my face.
I've since had the same crisps again and had no reaction, so I'm not sure what was going on.
If I were you I'd probably try giving it in some other form, mixed in with something else, to see what happens, like in a curry, before giving it again in a more "raw" form.