I noticed it the other day. We just got a new Russian Blue kitten who annoys her and plays a little rough. I thought she had a small scratch from him. But now the whole area around her eye is swollen. If you touch it, she pulls away fast, but doesn't growl or hiss (but then again, she is a very gentle cat.) The area around her eye has a lot less fur than the rest of her. It looks like the eye is half shut.