My back and upper arm have a lot of pimples. even if i leave them alone, pimples will keep growing in these areas. how do i get rid of them?

Keratosis Pilaris: Keratosis pilaris is a common skin condition that causes rough patches and small, acne-like bumps, usually on the arms, thighs, cheeks and buttocks. Keratosis pilaris bumps are usually white, sometimes red, and generally don't hurt or itch. Keratosis pilaris can be frustrating because it's difficult to treat. Cerave sa which is over the counter is an effective treatment.