orange spots on the skin sounds like mites to me, you need ivermectin :-)
I just had a ferret in with over 100 tics, they can cause lyme disease if left. Nasty little buggers they are. we managed to pick 63 off before he got fidgety, frontline has had the rest of them dropping off.
If you get some ivermectin you will see those orange spots dissapear, he will probably need 3 treatments though 3 weeks apart, the first treatment kills the living mites, the second kills the eggs as they start hatching and a third just to make sure although sometimes you can get away with just the two.