I noticed a hairless area on my frenchie about one week ago. It was flaky and raised up a bit. We saw his vet this past Wednesday where they gave him Nexgaurd which I was told clears up skin conditions. Two days later I've noticed one spot on his chest and one on top of his nose. The one on his chest looks red, raised, and scaly. Vet is treating for mites which the Nexgaurd will clear up. But it seems to be spreading. What can I use to clear this up. I understand frenchies are prone to skin problems so any advice is welcome. I don't want this to continue to spread.