Here's a cool fistula, You'll love it!
Artists can create "passages" like this in their body by piercing themselves and forcing the holes to remain open as they heal. So these aren't "wounds" per se, they'll eventually grow shut, much like ear piercings, if they aren't kept open, but otherwise they remain indefinatively.
Now, to relate this to trans people: Imaging one those passages is connecting the elementary plane of poop to an open wound in your crotch full of blood and puss...
and the fistula is kept open by a constant stream of shit.
It will never heal on it's own.
Without a revision surgury you're left to shit out of your cunt for ever and ever. And there's no guaranty a revision surgury will work anyway.
As a species we have made remarkable achievements in accidental cruelty. I'm very proud of us.