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Could be an allergic reaction if none of the vet treatments have worked, but my first guess would be something pathogenic, possibly fungal. In your shoes, I'd probably trim the hair short around one of the spots and do a twice daily wash with a general-purpose antifungal like Absorbine Sr. If it shows improvement after a week, I'd proceed with treating the rest of the spots, and if not the next try would be another vet or an elimination diet.