The really simple method of controlling acne on the body is wiping off with isopropyl alcohol. I used to have acne problems on my back, front and shoulders (none on my face though), and a coworker suggested the alcohol. The explanation of why it works is because the skin produces more grease/oil/waste on a cycle, and bacteria thrive on the grease/oil/waste on the skin. Wiping off quickly with alcohol kills the bacteria, and thus the acne stops. You have to do it every day, but it is worth it.