Yeast diaper rash

Courtnie

My son is 6 weeks old and has a small patch of diaper rash on his pelvis area. Right above his privates. It’s not too bad yet however it hasn’t gotten better with any of the creams I’ve tried. I have even tried different diapers. I want to get on top of it before it gets worse. I think it may be a yeast diaper rash. What can I put on it over the counter to clear it up?