What would turn a chickens nostrils black? Photo

I have noticed when the sun hits them just right and they shake their head you'll see a spray. Maybe it's the hay? But why the diarrhea?
 
I have noticed one leghorn has lost some weight compared to her sister. They used to be the same size and she looks a little roughed up now. But she still lays. But sneezes a lot and we picked the black gunk of her beak but it's back the next day.
 
Could be an respiratory infection/illness ..
It's hard to diagnose "online"
Vet would be the best option.
 

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