Hello. We bought 3 hens (a Brahma and 2 Cinnamons) from a man here in NW Missouri on Wednesday. He had just purchased them the same week at a Missouri auction, and the Brahmas had come from an overcrowded situation so they had no feathers on their backs. (I noticed a Cinnamon with one eye swollen shut in his chicken yard when we purchased these 3.) On Thursday we returned one of the Cinnamons because it's eye was glazing over and it seemed congested with some nasal discharge. The chicken seller said that it was just stress but that doesn't seem right. Now the Brahma's eye is shut and I'm afraid it's going to die. What can I do? ...I do have some Amoxycillin powder-form antibiotic. Will that help it? Photos below.