Rash/breakout

Olivia

What could this be? I’m a first time mom and freaking out because my daughter is all broke out! I took her to the doctor Tuesday for a rash and they said put Vaseline on it for a few days then if it doesn’t go away put hydrocortisone cream on it for 3-4 days, thought it was starting to go away and then I notice this! Should I try the hydrocortisone cream or just take her back? The rash I took her for wasn’t like this one