What can cause this?

Tamekia

I been using Huggies diapers and pampers sensitive skin wipes for the longest on my son and probably the past 3 months his bottom randomly get like this.. I took him to the doctor and they prescribed some cream (nystatin), but once again it came back a couple of weeks later.. I was thinking about switching diapers to see if they are the cause.. in the main time.. what are some good products/ remedies that can help with his bottom (I’m currently alternating putting nystatin and vaseline on him)

Update!!! I’ve started using cornstarch every diaper change yesterday afternoon and his bottom looks soo much better!! Thanks everyone!!!