Oh my oh my oh my. That had to hurt. Hurts me just reading it! We can get issues like a tear in that area (think child birth) and we heal. This is a burn? What you do after child birth is you use a spritz bottle of water (squirt bottle where you squeeze and it all comes out, like those Gatorade drinking bottles) and fill with room temp water and squirt AS you pee. And then they alternate with tucks medicated wipes that you leave in your undies as until the next time you go to the bathroom, and then preparation H until the next time you go to the bathroom, back to the tucks wipes in panties.
But let me say this . . . in all honesty. This is a burn and a tear, right? Can you have a doctor look at it? I'd be careful about applying things. I'd try to keep your hands of it in general so it doesn't get infected. Is a doctor taking a look possible?