Horses can get various skin problems. Mange is created by little mites on the skin. The stronger the immune system of the horse, the less likely the horse will be to get mange. Use a rinse of Elderflower or try essential oils such as tea tree, neem, lavender or chamomile in a rinse daily until the problem has cleared up. Other herbs to consider are aloe vera, calendula, garlic and yellow dock. These can also be applied as an infused oil. Make sure the horse is free of worms.