Also my non-basenji has dry skin on her ears and she itches them and they start to have a small bleed this stain looks like that. Check the dog for any battle wounds!

Don’t scrub you are just pushing it in further. Pat dab. My little boy when I first got him and sometimes now has wet farts when he was a small puppy I had no idea they farted so much! He was sitting on my a few times and farted and it was a wet ones. I don’t know if this helps.