To stop itching, bacteria, and other skin problems, use a therapy shampoo to wash your horse.
Things to Consider:
Skin problems -- For horses with skin problems, a medicated shampoo can provide soothing relief, and also prevent the problem from spreading.
Conditioning -- Therapy shampoos will provide your horse with the skin conditioning ingredients that they need to reduce further drying, and keep the coat nice and shiny.
Wounds/Healing -- Nothing works better than a shampoo that disinfects and sterilizes an area where infection is a risk. There are many products available that are safe to use and will help your horse heal.