Keratosis pilaris (ker-uh-TOE-sis pih-LAIR-is) is a harmless skin condition that causes dry, rough patches and tiny bumps, often on the upper arms, thighs, cheeks or buttocks. The bumps usually don't hurt or itch. Keratosis pilaris is often considered a common variant of skin. It can't be cured or prevented.

Keratosis pilaris is a common condition where small bumps develop on your skin, especially your arms, legs or butt. Excess keratin in your skin causes bumps to form. This condition is harmless and typically doesn’t need treatment, and usually fades by age 30. Treating dry skin with a gentle skin care routine can help.

Keratosis pilaris, when dead skin cells get trapped in pores, commonly causes arm bumps. But if the bumps are itchy, they may result from other skin conditions, including eczema, hives, or folliculitis. Bumps on the arms often result from keratosis pilaris, commonly known as chicken skin.

Keratosis pilaris is a common cause of bumps on the arm. These bumps are harmless and may look like goosebumps or chicken skin. However, if the bumps are itchy, this may point to eczema, folliculitis, or heat rash. A person may not need treatment for the bumps on their arms unless they develop any bothersome symptoms, such as dryness or itchiness.