Brennan is currently suffering from a case of this. It's where they bang their tail on hard objects and bust it open. Apparently it's really difficult to treat and I can see why. I've been cleaning it thoroughly and started wrapping it today. Going to change the dressing once a day for the next few days to see how that goes. He keeps knocking it against stuff and making it bleed, so this should help. He's quite the happy boy.
Anyway, just wondered if anyone else had any treatment method suggestions to share.