Has anyone ever found blood in their ferrets ear?

I have been to the vet and they ran tests and found no mites, etc. We
tried Revolution and she is now on eardrops, Tresaderm but we are not
really sure what the problem is.

Also, do some ferrets just have a lot more earwax then others and can
cleaning just cause more to come back?

Thanks,
Liz

[Posted in FML 5639]