One of the big dangers of using DMSO is that it can help transport harmful substances into your body not just helpful substances.

So to be safe pre-wash any area you intend to use the DMSO on.
You don't want to transport say gasoline into your body.
( i personally work with biocides and i would never want to transport that stuff into my body)

And also it is possible to transport too much of a good thing.

So be careful.

This is not medical advice, but a safety warning about handling chemicals.