What is the best product for Keratosis Pilaris?

I have Keratosis Pilaris on my buttocks and I have been researching different products. There are quite a few and I don't know which to go with. There's Glytone, KP duty, Biotreatment. Has anyone had success with any of these or a better product? I have dark olive skin and I scar very easily...even without picking, so I'm hoping for a product that helps with that as well.