Persistent yeast diaper rash

What helped if your little one has experience persistent diaper rashes?

I thought the diaper rash was finally clearing up, decided to stop using one of the many creams we’ve used because it looked all gone. Of course I forgot to bring the cream during the Easter holiday and it was by far the worst diaper rash he has ever had. I felt so horrible, he couldn’t even sit in his high chair or anything, ugh...

Need help! Maybe probiotics or I’ve been reading tea tree oil has helped others??

Thank you for the advice!