Scale rot can appear red,orange,yellow,white or black. If it looks kind of white and crusty you should get your snake to a vet asap because it could be topical salmonella (dangerous to yourself and your snake). I don't mean to freak you out, it could just be scale rot afterall. I use diluted Bactine for treatment and it works really well. Just soak your snake in it every day and make sure that you dry it off really well. You should also use paper towel as a substrate untill your snake is back to normal. If you have any questions, feel free to e-mail me.