Hi, back when I first started breeding rats, I let my older sister keep 2 females from the original first litter I ever had. I just got a call from her and she said that both of her rats tails turned yellow and scaly, and flakes are coming off them. It sounds severe. I have never heard of anything like this. The fact that BOTH of them have it leads me to believe its some sort of disease, as opposed to just dry skin. They are not being neglected in any way, she loves those things. Any thoughts?