Thanks for writing here.
It seems you are having some sun related black spots like freckles.Betnovate
n is a steroid used only for eczema.
It is not advised to apply on face.
Stop it completely.You can use a mild steroid like hydrocortisone
for few days.This will avoid flare up which occurs after stopping betnovate.
Avoid sun as far as possible.Apply a good sunscreen at day time.
Such type of pigmentation can be treated by chemical peels
You can consult a dermatologist
for this and get treatment accordingly.
Hope this will help you.Take care.