Diaper rash remedied

Lisa • 21. Mommy to a 2 yo. Baby #2 due in December ❤️
My daughter has a bad diaper rash that's hurting her and I've been putting desitin maximum strength on every diaper change but it doesn't really seem to be working and I hate seeing her in pain when I'm changing her. Is there anything else I could do to help the rash go away?