I can't help but chime in with my recommendation of ilex Paste..... no I don't work for ilex.
After experiencing the most excruciating and agonising pain due to the the oozing and festering skin around my Stoma, it was the application of ilex Paste which brought instant, cooling and soothing relive; withing 3 days my skin had completely healed, no trace whatsoever; I continued to apply ilex, as a preventative measure until takedown.
Prior to discovering ilex, I had applied every cream, powder, spray, concoction and potion and nothing worked.
Since takedown, I've never actually experienced butt burn, although ilex Paste was initially created to treat and prevent butt burn.
I've used ilex Paste to treat anal fissures too.