Apparently you shouldn't scrub KP but use moisturising lotion with AHAs, lactic acid, salicyclic acid (found in acne treatments) or other fruit acids to dissolve the scaly skin.

One lady on the net goes even furthjer by first using a acne astringent/toner BEFORE using the moisturiser with AHAs- she must have it really bad.

I've started this for my upper arms (moisturiser only from Dermologica but Palmers Cocoa Butter does a AHA forumla as well), and it's really helping. I scratch too- bad habit, and end up with little sores and scars on my arms so this is helping a lot.