A pimple is a swollen, red spot that is often full of pus. Pimples, or zits, can develop anywhere on the body. Causes include the body producing too much oil, a clogged pore, or a medical condition. The condition keratosis pilaris often affects the skin on the arms, for example.
Pimples can look different depending on the person or the cause. They may appear as red, swollen, small raised bumps, blackheads, or white due to pus.
In this article, we cover some of the possible causes of pimples on the arms. We also discuss some treatments and prevention methods.