Hi ladies -
I have had KP my entire life and never knew what to do about it. I recently started using Eucerin Plus Smoothing Essentials lotion twice a day and it has made a HUGE difference. My arms look so much better! I still have some of the red dots, but I don't get as many of the bumps (that I tend to pick, which makes the problem 10 times worse). I noticed a difference pretty quickly, but have been using it religiously for about 4 weeks now and it's still improving.
I've tried the Dermadoctor KP Duty lotion and I think this actually works better. It's also much cheaper so you can actually afford to use it on large areas twice a day. I think they even carry it at Costco

I could never afford to use the KP Duty lotion twice a day.
Here's a link:
http://www.eucerinus.com/products/hb_plussmooth.html. It has Alpha Hydroxy and Urea which are both supposed to help KP.
I hope this helps! It's made me much happier.