@FeebysOwner , thanks for the reply!
I've been keeping a really close eye on it and his breathing. He's probably had it about a year, although sometimes it is more pronounced (like in the picture). I'll probably have a second opinion since the first vet he saw seemed to brush everything off...
My former feral has had the same sort of bump in his nose. When he first came in (mid-March last year) I didn't notice it for maybe a month, and assumed it was damaged from him head butting the trap. (His temperament did a complete 180 after neutering).
He has always had a bit of a sneeze...
Poor little guy - that's so scary for all involved.
I know you said it was virtually impossible he got out when you went outside, but it may pay to do a few things just in case that happened:
1. Put some used litter outside - the scent will help him find his way home if he is out there.
2...