Keratosis pilaris is a common skin condition that causes tiny bumps on the skin. The bumps often develop on the back of the arms.
Keratosis pilaris is mainly found on the upper arms, thighs, cheeks, or buttocks.
Keratosis pilaris can occur at any age, but it’s more common in young children. Signs and symptoms include
Keratosis pilaris results from the buildup of keratin -a hard protein that protects skin from harmful substances and infection. The keratin forms a scaly plug that blocks the opening of the hair follicle. Usually, many plugs form, causing patches of rough, bumpy skin.