Facial Hair Biology

A beard is the unshaven hair that grows on the chin , upper lip , cheeks and neck of humans and some non-human animals. In humans, usually only pubescent or adult males are able to grow beards. Some women with hirsutism , a hormonal condition of excessive hairiness, may develop a beard. Throughout the course of history, societal attitudes toward male beards have varied widely depending on factors such as prevailing cultural-religious traditions and the current era's fashion trends. Some religions such as Islam , Traditional Christianity, Orthodox Judaism and Sikhism have considered a full beard to be absolutely essential for all males able to grow one and mandate it as part of their official dogma.
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The biology of hair.

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Beard - Wikipedia

Hair is a product of small pits in the skin known as hair follicles. The most important feature of hair follicles is that their activity is intermittent; each active phase or anagen is succeeded by a transitional phase catagen and a resting phase telogen , during which the fully formed "club hair" is retained for a period and then shed. The growth of facial, body, axillary, and pubic hair depends on androgens. Facial hair and body hair require high levels of testosterone and its conversion to 5-alpha-dihydrotestosterone. Pubic and axillary hair follicles require much lower levels of hormone, and 5-alpha-reduction appears to be unnecessary. Paradoxically, male pattern alopecia and its female equivalent also require androgen for their manifestation. The differing lengths of hair in the various regions of the body result largely from differences in the duration of anagen and only to a small extent from differences in the rates of growth.
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Facial hair

What is the point of a beard, evolutionarily speaking? Children, women, and a whole bunch of men manage just fine without one. Beards may not necessarily attract a mate Credit: Getty Images. Researchers have therefore suggested that a second type of sexual selection may hold the answer. You also have to compete with the same sex for mating opportunities.
Facial hair is hair grown on the face , usually on the chin, cheeks, and upper lip region. It is typically a secondary sex characteristic of human males. Men typically start developing facial hair in the later years of puberty or adolescence , between seventeen and twenty years of age, and most do not finish developing a full adult beard until their early twenties or later.
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