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A: According to Dr. Isadore Rosenfeld, a noteworthy doctor with Parade magazine, acne is a hormonal problem. 

No food, including chocolate, can cause it. 

But because your mother warned you to keep away from chocolate back when you were a pimply teenager, you reflexively continue to pass that same advice along to your children.

Source: http://www.holisticbeauty.net/Acne_Troubles.htm