crusty hair

My piggie Marshall has got a bit of crusty fur above his nose and seems to be sneezing a lot, when I listen to his breathing he does seem a bit wheezy, should I be worried and take him to a vet ? Or is it fine ? I'm quite new to this as I've only had my two boys a year today and they have never...

I have a guinea pig that had "crusty" hair on her nose bridge. I ignored it because that was the only spot on her and the rest of her was nice and soft. I was petting her today while she was in her cage and I noticed that her back was now the same "crusty" texture. There probably is a better was...