Face and butt issues

[Ccort]

Thank you. I'm still not positive but what I saw on my phone screen looked like a roost mite. But it was in my house...
She had the scabs like mites but also some white stuff on her rear that potentially could be lice?
I still see no actual bugs on her.
I just did a full cleaning of the coop. Should I go ahead and treat the coop and birds? Is it harmful to treat if they don't have them?

 

[Eggcessive]

The white on her vent could be lice eggs, but also could be dried urates or kidney waste. If you have a magnifying glass and see a bug, the lice have 6 legs while the mites have 8. Leg mites are too small to even see.

 

[Ccort]

The ivermectin says it's treats biting mice, mange mites and sucking lice?