What would turn a chickens nostrils black? Photo

I have 5 hens just noticed there nostrils are black and lightly sneezing. They hsd mites and i used DE in their Coop. It's everywhere to stop the mites. I dusted them too. What should I do?
I would throw the DE away and get a permethrin based spray to treat both them and the coop with.
 

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