Skin care is one of the most common areas in which cosmetic chemists get to formulate. And acne is one of the most common problems they are trying to either prevent or cure. Here is a nice short video that explains exactly how acne is formed and how anti-acne ingredients work. It's quite good.
http://www.youtube.com/watch?v=vy6KX5bZOg0
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Learn more: This topic is covered in depth in our The Science of Cosmetics: A Complete Guide.
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