Courtesy of Paula's ChoiceBlackheads, whiteheads, breakouts; we've all dealt with clogged pores at one point or another. While clogged pores are totally normal, the right skincare routine can help clear stubborn blackheads-and no, pore strips aren't a part of it. To find out what causes clogged pores and how to treat them, E! consulted board-certified dermatologist Dr. Mona Foad. What Causes Blackheads? "Clogged pores happen when oil, dead skin cells, and sometimes environmental debris get trapped inside the follicle," according to Dr. Foad.