Hi Marion,
Thanks for your question.
It sounds like you have done a lot already in figuring this issue out. There is indeed a rare disorder of Husky-type dogs called “zinc-responsive dermatosis,” in which they have a genetic problem metabolizing zinc. This can cause localized skin problems and hair loss. However, there are many other causes of these signs as well. I would encourage you work with your vet to determine a clear diagnosis. This will help guide treatment, and ensure that you are selecting the right medications. Many skin disorders require a biopsy (taking a piece of affected tissue) and examination by a pathologist to determine a diagnose. You could also consider referral to a veterinary dermatologist (they specialize in skin disorders).
Best of luck with your dog!
Dr. Kim Hester