Any one start having issues with honest diapers and diaper rash once your LO started walking?

We've been using honest diapers for a while but DS has a stubborn rash that won't go away. It's right on his leg where the edge of the diaper is so I'm wondering if it's rubbing!

Trying to debate on switching diapers. I just started putting coconut oil on it today to see if that helps.