Hello! Yesterday I found my hen with a swollen left eye/face, the other side is ok, other than that she is acting normal. There were some tiny bubbles in the corner of her eye, I applied a warm compress and today there were no bubbles. She is 4 yo and laying as usual. My other hens seems to be okay but I did lose 2 recently, one of them I just found dead and the other became lethargic and not eating/drinking until she died. I have read a lot of posts and it seems like it is a respiratory disease, maybe Mycoplasma. I'm thinking of treating her with either Denagard or Tylan. The first thing recommended is to isolate the hen but in my case if she does have a respiratory disease then by now all my hens would have it as well, probably the cause of death of my other hens. My question would be if I should treat all my hens, I have never used antibiotics on my chickens and wouldn't want to unless it is absolutely necessary. Any advice would be greatly appreciated. If it looks like something other than respiratory please advice. p.s Culling is not an option, specially this hen, it belongs to my 8 yo daughter and she is already worried her chicken is going to die like the other ones.