I have a nine year old silky hen who has been producing a terrible substance in her nostril for about a month. It is just on the left side. It is crusty and hard on the outside but chunky like cottage cheese on the inside. It is yellow and smells absolutely horrible! It also seems to be eating away at her nostril. I pick out what I can every morning and apply Neosporin. When I get a really big chunk it seems to tear the nostril and there is some bleeding. Regardless of how much I remove, there is more the next day. She does have slightly labored breathing, but seems normal other than that. She does share a coop with seven other chickens, and other than molting at a terrible time of year they are all fine. If anyone has any idea what this could be, please let me know.