Adult has two types of
hair. The typical hair on scalp that grows
long and on an average, measures 65 to 75
microns (0.065 to 0.075 mm) in diameter (width)
is terminal hair.We also
have short, fine, light-colored hairs called
vellus hair (Baby hair).
At puberty, the increase in hormone levels
(Testosterone) causes vellus hair in the pubic,
armpit and male beard areas to grow deeper
and longer and become terminal hairs. Terminal
hair becomes villous hair in baldness
