Are these signs of mites, lice, molting?

[Tanaduk]

Started noticing some what appeared to be some patches of feathers missing on this hen and upon investigation, seems to have crusty dark areas at the base of some feathers. Are these signs of mites?

 

[Wyorp Rock]

Welcome To BYC

Sort of looks like dirt or mud.

Here's an article to help you I.D. external parasites:

https://the-chicken-chick.com/poultry-lice-and-mites-identification/