Editing Acne (section)

==Epidemiology==
Globally, acne affects approximately 650&nbsp;million people, or about 9.4% of the population, as of 2010.<ref name=LancetEpi2012>{{cite journal | vauthors = Vos T, Flaxman AD, Naghavi M, Lozano R, Michaud C, Ezzati M, etal | title = Years lived with disability (YLDs) for 1160 sequelae of 289 diseases and injuries 1990-2010: a systematic analysis for the Global Burden of Disease Study 2010 | journal = Lancet | volume = 380 | issue = 9859 | pages = 2163–96 | date = December 2012 | pmid = 23245607 | pmc = 6350784 | doi = 10.1016/S0140-6736(12)61729-2 }}</ref> It affects nearly 90% of people in Western societies during their teenage years, but can occur before adolescence and may persist into adulthood.<ref name="Taylor2011"/><ref name=BMJ2013/><ref name="ReferenceB"/> While acne that first develops between the ages of 21 and 25 is uncommon, it affects 54% of women and 40% of men older than 25&nbsp;years of age<ref name=Kong2013/><ref name=Holzmann2013>{{cite journal | vauthors = Holzmann R, Shakery K | title = Postadolescent acne in females | journal = Skin Pharmacology and Physiology | volume = 27 Suppl 1 | issue = Supplement 1 | pages = 3–8 | date = November 2013 | pmid = 24280643 | doi = 10.1159/000354887 | s2cid = 40314598 | type = Review }}</ref> and has a lifetime prevalence of 85%.<ref name=Kong2013/> About 20% of those affected have moderate or severe cases.<ref name="Bhate2013"/> It is slightly more common in females than males (9.8% versus 9.0%).<ref name=LancetEpi2012/> In those over 40&nbsp;years old, 1% of males and 5% of females still have problems.<ref name=BMJ2013/>

Rates appear to be lower in rural societies.<ref name="Spen2009"/> While some research has found it affects people of all ethnic groups,<ref name=Shah2010>{{cite journal | vauthors = Shah SK, Alexis AF | title = Acne in skin of color: practical approaches to treatment | journal = The Journal of Dermatological Treatment | volume = 21 | issue = 3 | pages = 206–11 | date = May 2010 | pmid = 20132053 | doi = 10.3109/09546630903401496 | s2cid = 27893826 | type = Review }}</ref> acne may not occur in the non-Westernized peoples of [[Papua New Guinea]] and [[Paraguay]].<ref name="Tan2015">{{cite journal |last1=Tan |first1=J.K.L. |last2=Bhate |first2=K. |title=A global perspective on the epidemiology of acne |journal=British Journal of Dermatology |date=July 2015 |volume=172 |issue=Supplement 1 |pages=3–12 |doi=10.1111/bjd.13462 |pmid=25597339 |s2cid=19433549 |type=Review |doi-access= }}</ref>

Acne affects 40–50&nbsp;million people in the United States (16%) and approximately 3–5&nbsp;million in Australia (23%).<ref name=Koo2014/><ref>{{cite journal | vauthors = White GM | title = Recent findings in the epidemiologic evidence, classification, and subtypes of acne vulgaris | journal = Journal of the American Academy of Dermatology | volume = 39 | issue = 2 Pt 3 | pages = S34-7 | date = August 1998 | pmid = 9703121 | doi = 10.1016/S0190-9622(98)70442-6 | type = Review }}</ref> Severe acne tends to be more common in people of Caucasian or Amerindian descent than in people of African descent.<ref name="Goldberg2011"/>