Pubic louse (also known as 'crabs')

Exclusively on humans, primarily inhabiting coarse bodily hair such as pubic hair, but occasionally found in armpits, chest hair, or eyelashes.

Obligate hematophage; it feeds exclusively on human blood several times a day.

Slow-moving and sedentary; they use specialized claws to grasp hair shafts and remain close to the skin. They cannot jump or fly. The life cycle consists of the egg (nit), three nymphal stages, and the adult, spanning about 25–30 days.

Risks include intense itching (pruritus) due to an allergic reaction to their saliva, and potential secondary bacterial skin infections from scratching. They are typically transmitted through close physical or sexual contact. Benefit: None to humans; they are strictly parasitic.