We got two kittens only to find out that our 4 year old son was allergic. He would sneeze, cough, get congested, and his eyes would get swollen, puffy, and red. I started having him drink lukewarm chamomile tea when I read that it was a natural antihistamine. It seems to reduce his allergies significantly. When his eyes get swollen, I also apply a used chamomile tea bag to his eye/eyes. It brings down the swelling immediately.