Have you tried natural moisturizers like pure virgin coconut oil or shea butter?
I only use natural soaps made with good oils, no commerical soaps or moisutrizers for me.
Rainier soaps are excellent, I have purchased from them numerous times. She sells on ebay too. I saw on her website recently that she has lotion to relieve PUPPP symptoms.
I like tropical traditions for coconut oil and african shea butter company for pure shea butter. http://www.rainiersoapworks.com/puppp_relief.htm http://store.africansheabuttercompany.com/ http://www.tropicaltraditions.com/
Now you also have to address what you drink and eat. Drink pure water daily. Eat only pure oils like olive, coconut, walnut, flax seed oil, and good oils that nourish you and your baby. There are links here regarding diet and oils.
Certainly eliminate processed foods and hydroganated oils from your diet.
Good luck on this and on your impending delivery.
PS, coconut oil is wonderful for you and your baby and breast milk production. Read up on it :-)