Pubic louse (or crab louse)

Primarily coarse human body hair, most commonly in the pubic region, but also occasionally armpits, beard, or eyelashes.

Obligate hematophage, feeding exclusively on human blood several times a day.

They are sedentary and move very slowly; they spend their entire life cycle on a human host. Eggs (nits) are glued to the base of hair shafts and hatch after about a week.

Risks include intense itching (pruritus due to an allergic reaction to saliva) and blue spots at feeding sites. Benefits are none; they are strictly parasitic, though they are not known to transmit major pathogens like body lice do.