Keratosis pilaris (KP) is a very common skin condition that causes small, rough bumps on the skin. These bumps usually appear on the upper arms, thighs, cheeks, or buttocks and are often described as looking like “chicken skin.”

Keratosis pilaris develops when keratin, a natural protein found in skin, hair, and nails, builds up around hair follicles. Instead of shedding normally, the keratin plugs the follicle opening and forms small bumps.