L.O.
Those little rough red or white bumps that annoyingly plaque the backs of arms and sometimes the thighs are called "keratosis pilaris." They're not acne, it's actually a genetic follicular skin condition that's also known as "chicken skin" because of it's resemblance to, well, chicken skin. A cream made with urea like callous softener sometimes helps.
My Son's went away after taking a pharmaceutical grade Omega III for about 3 weeks. We purchased them through our physician but you can get them at this site: http://www.visionary-wellness.com. Under products in the heart health section. Good luck, hope this helps.