I had a horrible time with butt burn... I would cry.. it was awful..
I used gauze pads and soaked them in baby oil.. I used that instead of toilet paper or baby wipes. Even the sensitive/fragrance free baby wipes made me raw and I would start to bleed...
The baby oil would cause itching, so I used cornstarch after I wiped with the baby oil soaked gauze pads. This was the best "recipe" that worked for me (& still does when I need it).
My surgeon also wrote me a script for a lidocaine gel... I used it when it was really really bad...