Acne vulgaris is the most common type of acne.  It is characterized by different things for different people.  There are subcategories that require greater care, scar more easily, and otherwise cause greater problems, and of course there are greater severities in some individuals than others.  It can be aggravated by multiple systems, however nobody has actually determined a true cause at this point.  They say that hormones are the biggest factor so far.  However, stress, toxins, diet, and dirtiness of the face and skin have all been blamed to some greater degree.  There have also of course been cases where people manipulate hormones using steroids or manipulate the body using drugs and amphetamines, and in those cases obviously it creates more stress, more sweat, greater hormone imbalances, and otherwise.  For the most part, it’s apparently testosterone that aggravates it to a greater degree.  But unfortunately, not knowing the true cause of acne, there is no cure at this time.  There is only waiting until it stops on its own and in the meantime addressing the reasons we know about to try to keep it at bay.  So if you hear about an “acne cure”, then brush it aside.  There is no such thing.