It's not exactly natural, but what really helped my KP (also on my upper arms) is a one-two punch of Paula's Choice AHA (http://www.paulaschoice.com/shop/skin-care-categories/aha-and-bha-exfoliants/_/Skin-Perfecting-Eight-Percent-AHA-Gel-Exfoliant/) and BHA (http://www.paulaschoice.com/shop/skin-care-categories/aha-and-bha-exfoliants/_/Skin-Perfecting-Two-Percent-BHA-Gel-Exfoliant/) exfoliants, applied after my shower.
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