Probiotics for acne or are there other natural remedies?

Forgive my frankness: Acne is a serious, chronic, non-lifestyle-related disease that any primary care physician can manage most of the time. The evidence for "natural remedies" for acne is interesting but at best anecdotal & these are at best supplemental. Don't let some slick promotion by an internet "natural medicine" charlatan deprive some teen of treatment that's required to prevent physical and emotional scarring.