Pubic Louse (Crab Louse)

Natural Habitat

Exclusively found on the coarse body hair of humans, primarily in the pubic region, but occasionally on eyelashes, eyebrows, chest hair, beards, and armpits. They latch onto hair shafts near the skin.

Diet & Feeding

Hematophagous, meaning they feed exclusively on human blood. They bite the skin to access blood vessels.

Behavior Patterns

They are relatively slow-moving and generally remain attached to hair shafts using their specialized crab-like claws. They do not jump or fly. Their life cycle consists of three stages: nit (egg), nymph, and adult. They transmit primarily through sustained, close physical contact.

Risks & Benefits

Risks: Infestation causes intense itching (pruritus) due to an allergic reaction to their saliva. Scratching can lead to secondary bacterial skin infections. They are irritating but are not known to transmit disease. Benefits: None known; they are obligate ectoparasites.

Identified on: 3/5/2026