Can you have a fecal done at your vet? He might have a heavy load of parasites that need treating. You didn't say if you saw any white.
I'm just sure I'd have him on antibiotics at this stage, not enough info there to warrant it.
Yes, I hesitate. I hesitate because its better I get them on the...
He looks like he's been poking around in burnt charcoals. I've never seen anything like this. Not sure I'd have him on antibiotics without more info. If this turns out to be some type of fungus and not him poking his head where it doesn't belong the antibiotics could make it worse.