Here is some more information...
Infectious Coryza
Synonyms: roup, cold, coryza
Species affected: chickens, pheasants, and guinea fowl. Common in game chicken flocks.
Clinical signs: Swelling around the face, foul smelling, thick, sticky discharge from the nostrils and eyes, labored...
It may be Infectious Coryza. Here is a link..... http://www.msstate.edu/dept/poultry/disbact.htm#ic
Here is another link to tons of different information..... http://ag.ansc.purdue.edu/poultry/extensio.htm#Diseases
Do they smell stinky at all?? I hope this helps.