DMSO is a VERY VERY powerful substance. Extreme care must be used with it. It is also used on horses to carry other substances to deeper tissues. You have to be very careful that the area to which it is applied is completely clean. If you were using it to, for example, sweat a leg with furacin you'd better be darned sure that furacin is the only thing on the leg and that you are wearing gloves.
DMSO is not really that dangerous. I have been taking it off and on for sometime (orally). There is adequate information On DR. Stanley Jacob's website to show how dmso can potentiate Antibiotics , so it well could have a positive effect.