Okay, I'll change everything out tonight and give him a good soak. I got some original Neosporin for him too, and I'll try a little on that spot--although I hope it is just something like a scar.
I always make sure to clean up any stray poop in the terrariums, but I tend not to dig around too much in the holes my tomatoes make. I'll start cleaning those areas too. I worry about Makoto though. He can spend days in one spot like a pac-man frog will, and he gets stressed out if I try to move him. Today he's already buried himself completely in the substrate in response to me messing with him yesterday. I guess I'll just try to clean up after he moves.
As for the spot on his back. I checked this morning before he buried himself, and it looks the same. I'm fairly certain that it wasn't there a few weeks ago. That's just the trouble. He's half buried in one spot for days and days so I can't see him well, and if I mess with him at all other than just feeding him, he gets all stressed out and reclusive. So, I always try to make sure I don't stress him. I guess I need to strike a balance between stressing him and making sure everything is okay with him. I don't have the same issue with my females as they're frequently active and I can give them a good look over all the time.