Best product for diaper rash?

Arin • Hadley Noelle 12/12/20💗married 7/15/20💍 Angel baby 8/9/18👼

My 8 month old has gotten a really bad rash from diarrhea. She cries every time she goes potty and when I change her. The area is red and raw. I'm using bourdeaux butt paste and giving her warm bathes. It's helping but not getting rid of it. Also any tips for helping a baby's upset tummy?