My 4 year old has had small pimple like bumps on the back of her arms for about 1 1/2 years now. Diagnosed as KP (Keratosis pilaris). In the past couple of days I have noticed more down her entire arms and now her elbows have large blistery bumps (on both elbows). She says it doesn't itch or hurt. Any ideas? She does have food allergies (egg, fish, and peanut). She has tried no new foods this week. She is also sensitive to scents. We have not changed laundry soaps, bath wash, or shampoos. Everything I can think of should be itchy.