Here is a good article that may explain what your dog might have: Skin Disease (Canine Seborrhea) in Dogs | petMD
The problem could of been brought on by a number of things or it cold be a inherited disorder. You might want to ask the vet for any suggestions. It is something you don't see often in yorkies but it can occur.
Here is another website that might be helpful too. Canine Seborrhea - Use Natural Remedies To Treat Skin Problems in Dogs
I hope you can get it figured out. I know it can be frustrating.
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