I’m a new rat owner but I’ve had them for almost a couple months now and everything has been fine up until this point. But I went to work and was gone all day so they didn’t get out of their cage like they normally do and when I came back I found one of my babies had this bald spot on his back that wasn’t there when I had let them out to play the day before. I have two rats and both of them are males, and they have always been cuddly and kind to each other. I let them out of their cage as much as I can and give them attention and love in their cage a few times a day. They have multiple toys and I just bought them more a few days ago.. I’ve been reading up on it as soon as I noticed the spot and think it was barbering done by the cagemate but I’m unsure.. what can I do to help heal the spot and/or stop this from happening again? Sorry if the photos are bad he doesn’t like me looking at his spot.