i need help, sick bp

[lanalizard]

hi guys, my bp seems to be sick. I got her/him a week and a half ago and was told not to hold him for at least 2 weeks to let him settle in. Last week I offered it a f/t fuzzy mouse (the bp is 1.5 feet) and he refused. He was free of mites and stuff and was very very healthy when i got him. By the way i traded my hedgehog for him from a guy in town. His tank is a 10gal since he is a baby still and he has a heat lamp which provides his heat which is 90F on the hot side and 76F on the cool side. well i bought some sort of reptibark from petsmart for it, i knew i shouldnt, i never used substrate like that for my bp's in the past but this girl seemed very knowledgeable and was holding my snake so i took her advice and got it. I threw the bag out after so now i dont know what it contained or even the name of it but its like reptibark or something. ANYWAYS, to my main problem, something this evening told me to take him out of the tank short of the 2 week period. He hasnt moved in a couple days so i knew something was wrong. I pick him up and immediately i notice MITES. I take off as much as i could on him and flip him over to find his underbelly scales brown, as if he was sitting in smeared feces. He also needs a good shed. whatis wrong with him??? i am aware of scale rot but im not sure if that is what it is.
anyone have any suggestions on maybe over the counter remedies i could use to treat both?