Like I said, I've been thinking it's just rub from the hog panel on the pen and feeders. So he's had it for awhile and nothing else has shown up on the other bucks he's in contact with. They rub heads and necks and all during the rut. Just thought I'd throw it out there in case anyone had seen anything like this. Thought about rubbing an antifungal topical or wound spray on it just for the hell of it.