I've been trying to lighten my dark elbows for a long time. I've used labidjanaise, bamakoise, carowhite, h20 hours, lightenup and nothing works. I bought pigment doux 5 days whitening milk and i've been using it for 3 weeks now and my elbows are still dark. I exfoliate my elbows everyday with like papaya soap. It is not working. I have a feeling that my elbows aren't able to lighten. Could this be a medical problem? Please help. What do I do?