a quick note to the viewers in the audience who aren't familiar with DMSO therapy: be sure that your skin is freakin' crazy clean and sterile before putting DMSO on it. Whatever's there is going straight into your bloodstream.
It's a common naturopathic thingie, but the FDA hasn't approved topical DMSO for any theraputic use that I know of. Commonly used as a linement for horses, for degreasing engine blocks, and as a cryoprotectant when freezing cell samples. Whether you want that stuff in your body is up to you.
+1 What Req said (more explanation & disclaimers
were needed actually). I was turned onto it by a skeptical RN friend who has done a lot of research and now use it occasionally as a secret weapon for back and wrist pain. Obtained from the local feed store.