Degu Tail Chewing?
 

I have a Degu who is almost 7 years old and it looks as if he has been chewing on the tip of his tail. It was very minor at first and he never seemed to be bothered by it, but tonight I noticed that it looks very raw and I can actually see what appears to be bone or cartilage now. This has me very concerned and he now seems to be in pain since he is constantly moving his tail back and forth very quickly.

My Degu has been blind for the past couple of years most likely due to diabetes and I read that tail chewing/biting can be attributed to that as well since they may not be able to feel it or it is causing a lot of pain.

Is there anything I can do, I am very concerned about it getting infected.

I have attached a picture I just took of it. If anyone can provide any advice, I would very much appreciate it.

Thank you.