The person I had quoted had said that maybe the chin (which I clarified was the rat) could have injured herself and how did I know she hadnt. My response was she may have but from what I knew of mycoplasma it sounded more like that. I am planning on taking the rat to the vet but being this happened yesterday, I planned on waiting until tomorrow to take the rat in. Just wanted to make sure the chins were going to be ok and how concerned I should be. The rat only has it around one eye. Not the nose. Since you seem to know a lot about rats, does it sound like that to you? from what I know, mycoplasma is usually a symptom rather then a diagnosis to another ailment. Is that true? thanks