keratosis pilaris is a common condition in which bumps develop on the backs of the arms and thighs, buttocks and/or face as a result of hair follicles plugged with skin cells. The follicles feel rough and may look pink or red in color. It is most common on the backs of the upper arms, but may involve the cheeks, thighs, and buttocks. Treatment is with creams containing glycolic or lactic acid, and sometimes cortisone creams. Keratosis pilaris often recurs after treatment, but it usually improves over time.