If you are attempting to dry out the skin in order to combat acne outbreak, you are doing more harm than good. Drying out the skin is only going to make scarring easier if your friend has a habit to pop the zits, which nearly everyone who gets them will have. The best thing I have seen in people suffering from this is to go without a shirt as much as possible to air them out.
Some people reported results with the b5 regimine. I have heard it reported that taking Accutane 10 days BEFORE a cycle and 10 days AFTER a cycle will greatly decrease the amount of acne one may experience.
I have no first hand experience with acne or have ever suffered it, so I am just repeating what I have heard other people in real life say worked for them.