Kym Are you sure it's very dry skin and not irritation from tiny gnats. That is the area horses will rub when the gnats are out. Some call them sand flies. Whatever, they have a nasty bite for their tiny size. As soon as the bugs show up in spring I make liberal use of petroleum jelly, rubbing it in to the tail, especailly hear the tail head, the anus, teats on a mare, base of the ears and chest. By slathering it on it will last about 3 days. I've tried almost everything known to man and this works best.