I noticed yesterday that both of one of my pullet's eyes were swollen. One way worse than the other. I took her in and started her on tylan 50. Just now I decided to soak the bad eye with a warm wet rag and it opened up to reveal a nasty cheese like substance. It doesn't stink. No other discharge or nasty smells. She does have mites but I assume that's a secondary thing. What is this? Please say it isn't coryza. I had a bantam hen that died recently after displaying similar symptoms. So far no other signs of it, including the baby the hen was raising at the time.