Possible cut??

Hey! So I've had my chinchilla's for nearly two weeks now and they're settling in pretty well :) However I noticed today that one of them has a little red mark under his nose (as shown below). I'm not sure if this is a little scratch or what (he may have fallen off a ledge and caught himself a little bit) but I was hoping someone would be able to tell me if it's anything to worry about? It's not scabby or anything like that. I've asked two breeders and they said to keep an eye on him but he should be fine. He's acting fine and I'm gonna do a weight check tonight. Do Chinchilla's often have small cuts like this? Is it fairly common (as they're like toddlers and fairly clumsy).

http://ift.tt/2eI9qBf