Pubic Louse (Crab Louse)

Natural Habitat

Typically found in coarse human body hair, most commonly in the pubic region, but can also inhabit eyelashes, eyebrows, chest hair, and armpits.

Diet & Feeding

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

Behavior Patterns

They are slow-moving and spend their entire life cycle on the host. They attach themselves to hair shafts and move between hosts primarily through close physical or sexual contact.

Risks & Benefits

Causes intense itching (pruritus) due to an allergic reaction to their saliva. While they do not transmit major diseases, secondary skin infections can occur from scratching. They provide no ecosystem benefits.

Identified on: 3/12/2026