I've read many articles about the mycoplasma and I think my little guy has it. I know I bought him that way cuz he's always made the noises. He's probably close to 3 months but has barely grown and he is already balding. And his whole back his really red and sometimes flakes little red but doesn't look like mite or anything. M best friend has a litter mate and she I totally fine. Never makes the noises and looks healthy as can be. He also goes to a class with me sometimes twice a week and none o those rats show any signs like him. Isn't the mycoplasma contagious? He is always at his litter mates house and they play all the time so wouldn't she have it to? Also, could the skin thing be something else that I can treat?