Well, my horse has recently been turned out in a pasture with 5 other horses, four of which are geriatric residents of the barn, so my horse is the second youngest, and the biggest.
Despite this, I think he is being bullied. He has come in the last few days with his ears bleeding, I've cleaned them off, and put an ointment on them.
I've attached a picture below, as you can see it's not wear the halter is, so it can't be halter rub, and he wears a fly mask, so that also confuses me! [how could other horses bite through the mask?]
So I'm kind of doubting that the other horses caused it, but I don't know what else has caused it.
Here's what it looks like, it's the same on the other ear too [sorry he moved when I took the picture it's a little blurry] :