Using steroid creams over genital mucosa...which class of steroid used matters.
Class 6 and 7 can be used for limited time with a prescription.
Any moisturiser with light liquid paraffin and white soft paraffin will suffice.
Next Steps
However, considering this sensitive area, do consult a dermatologist .
Health Tips
Tip -> You can use a white colored moisturising soap preferably without fragnance.
Good luck