This morning I noticed that my 22 year old geldings muzzle is wrinkled up, and his left nostril is pushed in. Yesterday he had the airplane ears going, but I thought the gnats were bothering him. Any help with what could be going on would be helpful. Have a call into my vet, but she hasn't called back yet. Thank you.

Well, this is some bad news. You can check the following website. Hope this will give you some help. (lifecellskin.us/)

What do you mean by his nostril is pushed in? Do you have any pics?

This was such an very bad news and i am really very sad after reading all of this things. if anyone can knew about this than please help here.

yes, what do you mean by pushed in? Sucked in?