Chinchillas problems.

Hey guys, I've had my chinchillas for a few months now. When i first got them, one of them had a little messed up fur around his left eye. I took him to the vet and he gave me some antibiotics. It worked, but I still noticed the messed up fur. Recently, I have noticed his eye is acting up again. It has some white stuff around the front rim of his eye. I have read on some forums and it says that it can just be a eye infection. I haven't given either of my chins a dust bath in about 2 weeks since I started noticing it. The one with with eye problem eats fine and plays normally. He has been squinting a lot also =/. I'm hoping it is just an infection and will be taking him to the vet this saturday. Any ideas?