Thanks for writing in.
You are right that we don't want to use a cream with a steroid to treat a fungal infection
( yeast is a fungus). Rather than curing it, it will make the infection worse.
You can use Lotrimin cream. It has an anti-fungal drug and does not contain a steroid. It contains clotrimazole
which is better than nystatin
for treating yeast infections
Hope this helps.