Swollen hock treatment?

I noticed a cut on the front of my mare's hock. It is hot and swollen around it, but the cut is not even deep. It's more like the skin just got shaved off leaving a quarter or half dollar sized scrape. She pulls her leg away from me when I touch it, but I managed to get it cleaned up without getting my head taken off. I already called the vet and set up an appointment for Wednesday afternoon. Is there anything I can buy (or make) to put on it to get her along until then? I just want to make sure she's as comfortable as possible. I am planning on hosing with cold water for the swelling. Should I be walking her lightly or not? The cut itself is not serious at all, but I am afraid that her joint is infected.... :(