3 of 4 chicks hatched by one of my Barred Rocks last week have gotten these blister-like spots on their beaks. Two have swollen eyes, the third's eye is swollen shut. I've searched the internet and, so far, haven't hit on anything that explains it. I've observed no other symptoms. None of my other birds have had any illnesses. I'll keep searching the internet, but I'm hoping someone here can help me diagnose this. Thanks!