Don't try this for the first time in an emergency situation - practice putting the PVC splint on a quiet, healthy horse first, and have your veterinarian help you. Iodine, Betadine or Nolvasan. Fly and insect repellents. These products are used to help draw infections or abscesses to the surface, and are especially useful for hoof wounds. There are a number of excellent poultices available through your veterinarian or farm supply store.
Poultices help reduce leg swelling.
Plastic or brown paper wrap. Used as a wrap over a leg poultice. Many commercial products are available that can be added to the food or water or given directly by mouth. These can be used in extreme heat or humidity and in medical conditions such as shock and colic. Used as a foot soak for abscess other hoof pain.