Aqueous cream is also very good. I had a Spanish horse who developed mud fever one summer (don't ask!) and it took me months of painstaking care to clear it up. It didn't respond to even steroid gell, and my vet advised that the Animal Health Trust had given another of his clients a regime including E45, which I now think is better as a preventative, but I then started working with people with skin problems and discovered Aqueous cream. I used it on the horse every day to keep the skin moist and supple so that it wouldn't become chapped and let infection in and after that I never looked back. The biggest plus is that it is very cheap, under £2 a huge tub. People with eczema use it, and it is good for softening hard skin on heels and preventing them cracking, so should be excellent for capped elbows. You can buy it at any chemist.