Please help I’m freaking out

I had surgery a week ago on Friday 2/14. Monday I felt what I thought was a heat rash between my thighs so I used some aquaphor and let it have some air. As the days passed the rash got worse and spread quickly. It now covers my entire groin area and has spread under my breasts. It burns and is a little itchy. I had a virtual visit on Thursday and I was prescribed ketaconazole cream and diflucan and it hasn’t seemed to improve.