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I just recently purchased some DMSO at the Tractor Supply store near me for a trigger thumb issue I'm having. I was nervous too, there are a lot of scary warnings out there! I just made sure I washed my hand with as hot of water as I could handle (and soap), patted dry and applied with a cotton ball.
I believe it's helping! So for your foot, soak and wash really thoroughly, let it sink in and dry on your skin for 15-20 minutes and then rinse off keeping in mind that if you use soap to wash it off, it could possibly take the soap through your skin...? I'm not sure if that's over-cautious, but better safe than sorry! Then use a white sock to be safe, I've read it can take clothing dyes right through the skin as well...
But I have been rinsing and putting my hand into a black thumb brace to keep it from bending and have had no issues...Good Luck!
