What Skin lightening treatment do you recommend to even out and lighten my skin on the lower butt area? My backside are gets darker as it goes higher. I am satisfied with the skin tone of my legs and thighs except for my lower butt. It's very dark. I've been using Proactive skin lightening lotion for the past 2-3 days to see if it'll lighten up. I don't know what else to use.