I just posted a few days ago, about my bp was doing the same thing. I took George to the vet. he has pneumonia, he is on baytril antibiotics. I have to give him shots for the next 2 weeks. Please take your bp to a vet, one that specializes in Exotic pets. These people on this site are awesome, I asked help & they gave me help. Also keep the temps in your bp's home above 92-95.

George was making that little popping nose... and constantly opening his mouth. He had no white slime or anything that was mentioned about URI. But he did have this crust on his upper mouth. He moved around more today. I gave him a bath, he enjoyed that.