My ferret has fleas!?

If your not seeing anything on him, it may be mites. I have a guinea pig who had mites when I first got her. It never got that bad as to the point where she had scabs, because I noticed it right away. But have you noticed him slightly jumping? Almost as if he was about to have a sizure? Obviously it not getting that bad, but that can also be a symptom. Call your vet right away. They will be able to give you a definete answer as to wether its mites, fleas, or something else, and they can get your ferret the right treatment.