Yes right go and give the vet 35 quid for him to tell you yes it's earmites ????? Then give you some crap for another twenty ,??? Just get the anti paracite from the pet shop , if left untreated ear mites can be unpleasant for ferrets they loose there balance and go down hill , so I wouldn't hang about will cost you 4.50 at the petshop job done ,
So true some of our's had ear mites a few months ago used beaphar ferret spot on and now thankfully all gone it also treats any fleas etc