thanks for posting your query.
i can understand your concern.
c is not to be used on the face just for dark skin. its a steroid cream and using steroids
for long term on the face is not advisable.
it causes thinning of the skin. also it causes a change in the coulour of the skin, we call it hypopigmentation
i. e skin loses its natural colour.
now if your face is looking dull, please start using a high spf sunscreen, also you can use creams like ban a tan or demelan cream once at night over the face. this will help in lightening the skin from its current state. however you cannot change the natural colour of your skin.