Blackheads, surprisingly, aren't caused by dirt. Shocked? We were too. When Dr. Howard Murad offered up his advice and facts about pore size, blackheads, and how we can get our clearest, cleanest skin ever, we were all ears. Murad's Pore Reform Blackhead & Pore Clearing Duo ($50) will be available online and in stores the week of July 1. On Kirbie: Aryn K dress, Club Monaco blazer.