Whether you lift weights, run on a regular basis, or perform a range of different activities, you probably already know one of the biggest pet peeves any athlete encounters on a regular basis: skin troubles. They might be as mild as an occasional blackhead, or even something more severe such as full-blown acne, but impurities of all sorts tend to be a common problem for active people who work out regularly, if not even daily. Most are wondering: is it because of all the sweat?   Technically, no. Sweating is…