RTS - I wonder about the PI. You knew what you were doing, didn't wear gloves and were actually quite reckless about it. Like you intentionally were self-injuring.
Just an observation. Not trying to judge or anything, but can you see that?

I'm sorry you have a rash, PI sux big time. You should take extra Vitamin C and zinc to help internally heal. On the rash you can use apple cider vinegar, or a baking soda paste, or banana peels or even cucumber slices. Aloe vera is great when it heals, but don't use it while the rash is still weeping because it will cause spreading.