The other day, I found two long, dark, bumpy patches on Jerry's hind cannon bones. There was one on each leg, right in the middle. So I asked an experienced horse person at the barn if they knew what it was, and they said that it was a fungus like thing that most horses around my area get at least once a year. She said it happens when the horse pees and the pee splashes up on their legs.
So I scrubbed it in the wash stall, and then we put some MTG on it. Any other suggestions on what to do?