I am going to try Apple Cider Vinegar and coconut oil on my daughters who both have bad cases of KP. We have been using a foot sander to gently exfoliate their arms and legs once a week. This very cheap method is the only thing I have found that actually gives them smooth skin. They cost about $2 at any drugstore. It does not take away the red spots. It does help them feel better about the texture of their skin. I highly recommend for those with a heavy case. I have used KP Duty and other creams from our dermatologist but gentle sanding is the only thing that has actually helped us.