Keratosis Pilaris: Though you may not know it by its name, you have most likely seen this condition. It is extremely common and causes small, rough bumps on the surface of the skin. It mostly occurs on the back of your upper arms, thighs, and buttocks.
Folliculitis: Though these red bumps may look like a breakout, they are caused by inflammation and irritation of hair follicles. Folliculitis can occur anywhere on the body.
Ingrown Hairs: Ingrown hairs can cause whiteheads to develop on the skin. If your breakout is occurring around a typically hairy area, such as a beard or eyebrows, it may be an ingrown hair.
Boils: What looks like a massive pimple may be a boil. Boils look like supersized whiteheads and occur when your hair follicles are infected.