Aggressive fur chewing

My chinchilla Zeb has always been a bit of a fur chewer but it was limited to a little bit on his back left hip and that was that. As of this week, his chewing has intensified to the point where his whole left side has been chewed to the point where I can see skin. The skin does not look irritated and I have been combing the fur that is matted from his chewing but I was wondering if there's anything I can do? Have people had success with offering more chewables to distract chins from chewing themselves and could this be an indicator of a bigger issue? There have been no recent changes that would cause a sudden spike in his stress level.