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==Development== [[File:Tanner scale-female.svg|thumb|Tanner scale β female]] {{see also|Puberty}} Pubic hair forms in response to the increasing levels of [[testosterone]] in both girls and boys. Those hair follicles that are located and stimulated in androgen sensitive areas develop pubic hair.<ref>{{Cite journal|last1=Colvin|first1=Caroline Wingo|last2=Abdullatif|first2=Hussein|date=2013-01-01|title=Anatomy of female puberty: The clinical relevance of developmental changes in the reproductive system|journal=Clinical Anatomy|language=en|volume=26|issue=1|pages=115β129|doi=10.1002/ca.22164|pmid=22996962|s2cid=46057971|issn=1098-2353}}</ref> The [[Tanner scale]] describes and quantifies the development of pubic hair. [[Prepubescence|Before the onset of puberty]], the genital area of both boys and girls has very fine [[vellus hair]] ([[Tanner scale|stage 1]]).{{sfn|Green|1998|p=200}} At the onset of [[puberty]], the body produces rising levels of the [[sex hormones]], and in response, the skin of the genital area begins to produce thicker and rougher, often curlier, hair with a faster growth rate.<ref>{{Cite web|url=http://www.chla.org/profile/lawrence-neinstein-md|archive-url=https://web.archive.org/web/20160307161350/http://www.chla.org/profile/lawrence-neinstein-md|title=Lawrence S. Neinstein, M.D.: Adolescent Medicine β Children's Hospital Los Angeles|archive-date=March 7, 2016}}</ref>{{sfn|Rogol|2002|pp=25β29}} The onset of pubic hair development is termed [[pubarche]]. In females, pubarche is usually the second sign of puberty after [[thelarche]], though sometimes it happens before thelarche. In males, the first pubic hair appears as a few sparse hairs that are usually thin on the [[scrotum]] or at the upper base of the [[human penis|penis]] (stage 2). Within a year, hairs around the base of the penis are abundant (stage 3). Within 3 to 4 years, hair fills the pubic area (stage 4) and becomes much thicker and darker, and by 5 years extends to the near thighs and upwards on the abdomen toward the umbilicus (stage 5).{{sfn|Neill|Lewis|2009|p=25}} [[File:Tanner scale-male.png|thumb|left|Tanner scale β male]] Other areas of the skin are similarly, though slightly less, sensitive to androgens and androgenic hair typically appears somewhat later. In rough sequence of sensitivity to androgens and appearance of androgenic hair are the armpits ([[axilla]]e), perianal area, upper lip, preauricular areas (sideburns), periareolar areas ([[nipple]]s), middle of the chest, neck under the chin, remainder of [[chest hair|chest]] and [[beard]] area, limbs and shoulders, back, and buttocks. Although generally considered part of the process of puberty, pubarche is distinct and independent of the process of maturation of the [[gonad]]s that leads to sexual maturation and fertility. Pubic hair can develop from adrenal androgens alone and can develop even when the [[ovary|ovaries]] or [[testis|testes]] are defective and nonfunctional. There is little, if any, difference in the capacity of male and female bodies to grow hair in response to androgens. Pubic hair and [[underarm hair]] can vary in color considerably from the hair of the scalp. In most people, it is darker, although it can also be lighter. In most cases it is most similar in color to a person's [[eyebrows]].{{sfn|Sherrow|2006|p=315}} Hair texture varies from tightly curled to entirely straight, not necessarily correlating to the texture of the scalp hair.{{sfn|Sherrow|2006|p=315}}{{sfn|Morris|2007|pp=192β202}} People of [[East Asian people|East Asian heritage]] tend to have black, wavy pubic hair.{{sfn|Ogle|Fox|1998|pp=52β}} Pubic hair patterns can vary by [[Race (human classification)|race]] and [[ethnicity]].{{sfn|Morris|2007|pp=192β202}} Patterns of pubic hair, known as the ''[[escutcheon (furniture)|escutcheon]]'', vary between both the sexes and individuals. On most females, the pubic patch is triangular and lies over the [[vulva]] and [[mons pubis]]. On many males, the pubic patch tapers upwards to a line of hair pointing towards the [[navel]] (see [[abdominal hair]]), roughly a more upward-pointing triangle.{{sfn|Sherrow|2006|p=315}} As with axillary (armpit) hair, pubic hair is associated with a concentration of [[sebaceous gland]]s in the area.
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