Self Barbering?

[Mixalot2009]

My oldest rat Rocky has been having some issues with hair loss lately and I'm beginning to get concerned. it started towards his rump with no scabs so I figured it was just aggressive barbering and recently I've seen the hair on his front legs and chest has gone completely. There are no scabs at all so I don't think its mites but I have no Idea! my other three rats are fine expect one that had some scabs on his back but I think that was from a scuffle with our dominate male who can be rather aggressive at times (pulling ears, showing dominance, etc) any insight would be a great help. I will try and post pictures today of my boy later today. For reference i feed them a mixed diet (Kaytee Fiesta) and vegis every other day (peppers, carrots, apple, cabbage, Broccoli, etc)

 

[Mixalot2009]

There lots of flaky skin too. Could I be fungal?

 

[jorats]

Barbering is really hard to stop, I've never figured out but it doesn't harm them either. Barbering can be due to any kind of stress, boredom, arousal... hard to pinpoint.