Department of Dermatology and Cutaneous Biology, Jefferson Medical College of Thomas Jefferson University, Philadelphia, PA 19107, USA.
Clin Dermatol. 2010 Jan-Feb;28(1):31-3. doi: 10.1016/j.clindermatol.2009.04.002.
It has long been known that light is helpful in acne. Teens recognize that summer sun diminishes pimples, and wise pharmaceutical companies (which is limiting) know that a drug trial ending in sunny months will have an elevated placebo response.
人们早就知道光对痤疮有帮助。青少年们认识到，夏季的阳光会减少粉刺，而明智的制药公司（这是有限制的）也知道，在阳光明媚的月份结束的药物试验将产生更高的安慰剂反应。
