I would use Vetercyn or similar product. If you can order on line or go to a local tack feed store, see if they have furozone spray or a similar product that helps with staph infections . If you cannot find that, see if your local drug store has some tincture of green soap. Its a liquid soap. Mix 1/2 soap 1/2 water, squirt or spray on. It will clean and stop lots of infections ( I used it on myself on my foot for a staph infection) It will sting after a couple of treatments. Also I would try to keep that wrapped to prevent it from getting bumped and irritated. Use a cotton wrap , something you can change daily. If you think there is something in the leg, use a drawing salve/poultice on it.