thanks.Body complexion,fairness,colour is primarily genetically determined.However there is profound influence of environmental factors like exposure to sun,air pollution,environmental temperature.Nutritional factors such as adequqte protein and lipid in diet,vitamins of all ranges,minerals.Fairness or complexin is solely dependant on melanocyte content of skin and proper functioning of melanocyte.increase mlanocyte content causes poor complexion but gives greatest protection aganist skin cancers and detrimental effects of ultraviolet ray on sun exposure.Improving complexion bY using cream,oil,lotion,soap ,face wash, is not scientifically sound and proved.However,there are some medications like benzoic acid,cytotoxic drugs used for treating some diseases ,not for general use.So don't worry ,cheer up and be happy with your complexion.