Androgenic hair or body hair

Body hair, colloquially Androgenic hair, is the terminal hair on the human body developed during and after puberty.This body hair is differentiated from the head hair and less visible vellus hair. Androgenic denotes its growth is related to the level of androgens i.e male hormones in the individual. Due to a normally higher level of androgens, men tend to have more androgenic hair than women.

Normally vellus hair covers the entire human body, Except in areas like the lips, the backs of the ears, the navel, the palms of hands, certain external genital areas, the soles of the feet and scar tissue. The density of hair varies from one person to another.

Development and growth

There will be an increase in the levels of androgens during puberty which causes vellus hair to transform into terminal hair over many areas of the body. Different areas respond with different sensitivities. The sequence of appearance of androgenic hair reflects the gradations of androgen sensitivity. Since the pubic area is most sensitive, heavier hair usually grows there first. Genetic factors determine both individual levels of androgens and the hair follicle's sensitivity to androgens, and thus hair development.

Most noticeable thing in both males and females are the development of axillary hair and pubic hair. There is a sexual differentiation in the amount and distribution of androgenic hair, with males having more terminal hair in more areas. This includes facial hair, abdominal hair, chest hair, leg and foot hair and arm hair. Females retain more of the less visible vellus hair, though leg, arm, and foot hair is noticeable.

Hair densities and patterns on humans differ for different people in different countries and according to the local climatic conditions.

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