I didn’t always have acne scars. Though I nursed the occasional pimple as a teenager, my skin was smooth and relatively blemish-free. But once I left my hometown of Bayamon, Puerto Rico to study in Ames, Iowa in 2010, my relationship with my skin changed dramatically. By the end of that first semester, I had a blotchy, cystic acne-covered complexion that at any one time, could have five or seven...