It's most common on the: Keratosis pilaris rubra (KPR) is an inflammatory form of the condition that causes small, grainlike bumps and skin redness, primarily on the face, neck, chest, and arms.

In the 10th grade, Selina Ferragamo noticed large, red bumps on her groin ... I couldn't move my arms at all. It hurt to lift anything." It took years of fruitless doctor's appointments for ...