How long does it last diaper dermatitis?

Eli

My son is 14 weeks old and he got diaper dermatitis. I went to the doctor 5 days ago and she prescribed him two creams and I’ve been using them for 5 days and he is getting worse:(

The creams the doctor prescribed him are triancinolona acetonide 0.1% and Nystatin cream. I’m going to take him back to his pediatric tomorrow.