Is this mange?

[alittlenutz]

I'm new here. I have in my garden a new fox squirrel with a blackened face/muzzle, crooked blackened whiskers, and blackened feet, which don't appear to be very furry. I have a photo, but don't see a way to attach it to this post. Has anyone ever seen something or would recognize this condition? Is it mange? She is eating well and very active.

[Snowy]

Do you have black walnut trees nearby? My gray squirrels can be described the same way after foraging in the black walnut trees.