Have you ever heard "older" people say that chocolate can cause acne. Actually, it is not just chocolate who takes the blame when it comes to acne. But our beloved chocolate seems to be taking the most heat when acne is being talked about. The role of chocolate in acne has been controversial, to say the least. In 1969 Fullerton and colleagues published a study that showed chocolate has no effect on acne, and ever since dermatologists have insisted neither chocolate nor diet in general has any effect on acne. You may read about the study from 1969 here http://jamanetwork.com/journals/jama/article-abstract/350738.
Although there are more and more recent studies connecting chocolate to acne, we cannot play the blame game on this one because no, chocolate does not cause acne. Although breakouts are oftentimes contributed to a chocolate bar, research has concluded they are not correlated with one another or simply put, there is still no solid evidence that chocolate itself causes acne to "bloom". In reality, acne is caused by sebum, an oily substance that prevents the skin from drying out. Overactive glands responsible for sebum's production can ultimately become clogged, thus leading to acne. Risk factors that can worsen acne are changing hormone levels often occurring in puberty, oily skin products and make-up, stress, and irritating the skin by squeezing previous spots or scrubbing the face and not by chocolate.
So for now, it is safe to say that we can still enjoy chocolate without thinking too much about acne.