What causes acne and how you can prevent it

Dr. Melanie Grossman, a dermatologist based in New York City, explains what causes acne and how you can prevent it.

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Business Insider is the fastest growing business news site in the US. Our mission: to tell you all you need to know about the big world around you. The BI Video team focuses on technology, strategy and science with an emphasis on unique storytelling and data that appeals to the next generation of leaders – the digital generation.