[had to split message into two parts] -- The back of your neck is usually a sensitive area too (for whatever reason) if you want to test there first. But also the weaker the mixture the longer it will take to help .. so figure out a dilution rate that you can deal with .. and then maybe try it a little stronger the next time. Make sure you're using glass as mixing and storage whenever possible, (no metal, no plastics), the type of plastic bottle that it comes in is the only stuff it's not a solvent for. Other plastics might get dissolved a bit and you don't want to put that in your penis. Like I think i said before, even though DMSO is neutral and safe in the body .. it's also a powerful solvent that will take the coating off of your furniture (etc) if you drip any of it. Weird stuff.