Diaper Rash At Butt Hole Red And Raw Looking

My 7mo bb having quite bad diaper rash at butt hole and we figure it's due to her pooing 2-3 times a day as she's on solids now and full formula feed, previously was ebm. Seen pd twice and he gave antifungal cream and a stronger steroid when it came back. It gets better but later comes back again and became red and inflammed and not really responding to the cream anymore. She cries out in pain whenever she poo and we change her. Now I change her diaper every 2-3h and use the creams and desitin but not much improvement. Any good pd to recommend for diaper rash? I have concern on using steroids too much as it seems will always get better than worse. Help!