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Hair is an outgrowth of the epidermis in mammals. Hair is a characteristic of all mammals, though in some species hair is absent at certain stages of life.

Sometimes, the term body hair is used, to distinguish hair on the body from hair on the head. The difference between body hair and scalp hair (and, in males, chin and moustache hair) is that head hair for practical purposes grows continuously, whereas body hair alternates regular periods of growth and dormancy. During the growth portion of the cycle, body hair follicles are long and bulbous, and the hair advances outward at about a third of a millimeter per day. After a few weeks, body hair growth stops. The follicle shrinks and the root of the hair rigidifies. Following a period of dormancy, another growth cycle starts, and eventually a new hair pushes the old one out of the follicle from beneath. Head hair, by comparison, grows to great length, whereas body hair does not. Anthropologists speculate that the functional significance of long head hair is almost certainly adornment, a by-product of natural selection.

Hair serves a number of different functions. It provides insulation from cold weather and, in some species, from particularly hot weather. Because hair is often pigmented, it provides coloration. This might serve to camouflage an individual; in some mammals, the pigmentation changes with the seasons, becoming white during the snowy winter, for example.

  • Evaluation Of Excessive Hair Growth : Hirsutism
    Frederick R. Jelovsek MD: Evaluation of excessive hair growth and androgen testosterone excess.
  • Herbal Care New Zealand
    Organic products for weight loss, hair growth, and to stop smoking.
  • Hair Growth Solutions
    Company offers safe solutions for stopping hair loss and creating new hair growth.
  • Lucia
    Manufactures hair, eyebrow and eyelashes growth products made of natural Japanese ingredients. Based in Nagoya. Site in English, Japanese, and Korean.
  • Physicians Hair Growth
    Hair loss treatment center that supplies ReMox, a combination of minoxidil and tretinoin.