Terminal hair growth on arms is a secondary sexual characteristic in boys and appears in the last stages of puberty. The two main advantages are felt to be bipedal locomotion and greater thermal load dissipation capacity due to better sweating and less hair. The sequence of appearance of terminal hair reflects the level of androgen sensitivity, with pubic hair being the first to appear due to the area's special sensitivity to androgen. While the anagen phase for the hair on one's head lasts for years, the androgenic hair growth phase for body hair lasts a few months. Rising levels of androgen during puberty cause vellus hair to transform into terminal hair over many areas of the body. Archived from the original on 15 November In some cases, female beard growth is the result of a hormonal imbalance usually androgen excess , or a rare genetic disorder known as hypertrichosis. For example, even when one's particular distinguishing features such as face and tattoos are obscured, persons can still be identified by their hair on other parts of their body. There is a sexual differentiation in the amount and distribution of androgenic hair, with men tending to have more terminal hair in more areas.
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