How To Get Rid Of Severe Pigmentation On Face?

I had severe pigmentation i.e brown spots in my face for the past three years. I have been advised to use lomela cream and sun ban lotion by a dermatologist. But no use. The pigmentation is still there. Ofcourse it is not spreading. I am wearing specs and under the spex, both side of my chin, I have dark spots. I am nearing 43. Is it due to menopause?