I have a lot of clients with hyper pigmentation that I am treating.  Advising them to wear sunscreen, to apply a lightening cream and to go through a series of treatments to help fade it.  The question is coming up about using self tanners.  I see that some self tanners only add color to the epidermis, while others claim to work on the melanin.  Can that make their hyper pigmentation worse?  Does anyone have working knowledge of self tanners?  Which ones to stay away from or recommend.