I have had recently added four new chickens to my existing flock. I have had them for about two weeks (slowly introduced to the flock and all seem to be in good health. Yesterday I noticed one of the hens eyes swollen shut, I was thinking it was from pecking( I saw one of the hens get after her) from my existing flock but after reading the forums I'm not so sure. All my other hens seem fine with no noticeable issues. With the newly added four, I have 11 total hens with an 8x6 coop and a 20x6 run and they free range all day in the backyard. Any thought on what this might be?