Acne is thought to be largely genetic [1], which could explain why no one in that study had it.<p>Anecdotally, I had cystic acne as a teen and was cured after a single cycle of Accutane. It never returned, even though I kept eating the same diet - which included a lot of dairy and a lot of fast food.<p>[1] <a href="http:&#x2F;&#x2F;onlinelibrary.wiley.com&#x2F;doi&#x2F;10.1111&#x2F;bjd.12149&#x2F;abstract;jsessionid=3A9F532B7ADB09F31B44D85A25CE3811.f02t02" rel="nofollow">http:&#x2F;&#x2F;onlinelibrary.wiley.com&#x2F;doi&#x2F;10.1111&#x2F;bjd.12149&#x2F;abstrac...</a>