Yep, make sure they're mites. When you squish them does a little blood come out? If so, you got mites! Get a can of Provent-a-Mite(the only stuff that really works IMO) and spray the tank with it when the BP is not in it(soak him or something.) Make sure it's dry before putting him back in. You can get PAM on most herp websites... get it rushed to you or something.

Best of luck!