Can vitamin C creams help lighten skin when applied at night?

Depending on how much darker your face is to the rest of your body, yes, VitC cream can help to lighten your face.  At our practice we use Dermoelectroporation treatments to push those creams deeper into the skin making it more effective.  We also use a collagen serum to hydrate the face.  The lightening is mild and will take weeks with daily use but if the contrast between the face and rest of your body is not too much, then you'll see the results.  Even without the Dermoelectroporation treatments, the Vit C Cream and the Collagen serum will work with daily use.