Look for a peck mark in case it's a peck from another bird or an insect sting. It may be a chronic respiratory disease mycoplasma gallisepticum (MG) also called CRD. If it is MG, it would make your whole flock carriers for life, and it won't be cured, but symptoms may be treated with Tylan 50 or 200 injectable given orally or as a shot into the breast muscle. There is a lot of swelling of the sinus tissue, and if you see pus in there I would try to get it out. Terramycin eye ointment may also be something you would want to use in the eye. Here are some articles to read about it:Have a p chuck about a month old all of a sudden like over night with a very swollen eye no seeping or discharge swollen all the way shut
http://www.merckvetmanual.com/mvm/p...lasma_gallisepticum_infection_in_poultry.html
http://www.thepoultrysite.com/disea...tion-mg-chronic-respiratory-disease-chickens/
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