It looks like Scratches/Mud Fever. Lots of treatment options for it. Missy had a bit when I bought her, I scrubbed her with chlorhexadine and put A & D ointment on afterwards. She also went into a pasture without any mud or muck, a change from previous owner, that in itself helped a bunch. With those things it cleared up pretty quick.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.