Diaper rash WON'T go away!

Anne

My son is 5weeks old and has diaper that wont quit! It has been weeks! My poor guy! Have tried everything from desitin, petroleum jelly, petroleum jelly with tea tree oil, powder with cornstarch, and since seeing the doctor ive used an entire tube of nestatin. Made a mixture of that with clamoseptine. It has not gotten any better from using anything😩 i feel terrible! He is breastfed and once or twice a day has a bottle of formula. I dont know what to do! I am honestly embarrassed to post a picture of it😞