Keratosis pilaris is a very common skin condition in which skin cells that normally flake off plug hair follicles (tiny pockets beneath the skin from which hair grows). The condition results in small bumps that are usually white, but sometimes red. It most often affects the upper arms, buttocks and thighs. The bumps resemble goose bumps or chicken skin and are the texture of coarse sandpaper. It is a benign (harmless) condition.

According to the American Academy of Dermatology, up to 40 percent of the population has keratosis pilaris, and it is much more common in children (particularly adolescents). Its cause is unknown, but it appears to be hereditary. The condition is often worse during the winter, clearing up during the summer.

Among treatments for keratosis pilaris are moisturizing lotions to prevent dry skin, topical retinoids that regulate skin growth and mild peeling agents that may unclog hair follicles.