diaper rash help!


The rash appeared a MONTH ago, it was small and looked like 3 little dots surrounded by a small area of redness. It got better and looked like it went away but within days got larger and redder! It has spread into 2-3 diff spots by now spreading more than the last time. She doesn't show any signs of it hurting when I change her. I've used desitin, A&D ointment AND coconut oil along with letting her tootie air out with warm baths to help heal but nothing. I'm not sure what kind of rash it could be or if it's even a rash at all but a infection or eczema instead. I'm desperate, y'all. Tips? 

*I have a pic of what it looks like now if needed.