I talked to a few of the Dr's at my work, and since you mentioned that both of them have the same symptoms, and that yes, they both are licking and scratching more than before, they possibly do have either ringworm or mites. I know they were already tested, but the Dr's told me that they might not have gotten good enough samples. They were pretty quick to reply mites or ringworms after all the symptoms I described them. Ask your Dr. if they think it a good idea to recheck. Ringworm takes a few weeks (2 I believe) to culture and confirm a +/- . And mites..well, make sure your Dr takes a lot of samples (skin scrapings), from different areas of their body. Demodex are ticky little buggers as they tend to live in the follicles of the hair, so they have to get deep samples. Cheyletiella is also another one to look out for.
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