The bumps on your arms are most likely caused by a condition called keratosis pilaris, which is a common and harmless skin condition. Keratosis pilaris occurs when excess keratin in your skin causes small bumps to form around hair follicles, and it is often referred to as "chicken skin" because it looks like goosebumps. The bumps may look red, brown, white, or the same color as your skin, and they are usually painless and dont itch. Keratosis pilaris typically appears on your upper arms, but it can also appear on any other part of your body that has hair follicles. The condition is harmless and typically doesnt need treatment, and usually fades by age 30. However, treating dry skin with a gentle skin care routine can help improve the appearance of the bumps. Moisturizers containing lactic acid or salicylic acid can also help soften the bumps and improve the skins appearance. If youre concerned about your skin, you can consult your healthcare provider or a specialist in skin conditions (dermatologist) .