From: Zinc Raises Testosterone, So Why Does It Help Acne?

Using zinc topically and taking it orally has shown some potential in preventing and alleviating the inflammation and scarring associated with acne. Zinc may help nip zits in the bud by reducing the amount of natural oil, or sebum, produced in the skin. It may also help heal damaged skin around acne that does develop. Some research has indicated that acne formation results in part from a lack of zinc in the diet.