Pubic lice are tiny parasite insects which live in the coarse hair on the human body such as the pubic hair around the genitals. They are also sometimes found in underarm hair and in unkempt bushy beards.
Adult pubic lice are very small, not more than 2mm in length, and are visible in coarse hair. The lice lay eggs known as nits in brownish sacs which stick to the hair. When the eggs have hatched, the empty sacs are white.