Crab Louse (Pubic Louse)

Natural Habitat

Exclusively inhabits coarse human hair, most commonly found in the pubic region, but occasionally in eyelashes, eyebrows, armpits, or facial hair.

Diet & Feeding

Hematophagous; feeds exclusively on human blood by biting the skin.

Behavior Patterns

These are obligate parasites that spend their entire life cycle on the host. They are less active than head lice and tend to anchor themselves firmly to a single hair strand while feeding. They are transmitted primarily through direct intimate contact.

Risks & Benefits

Risks: Causes intense itching (pruritus) and skin irritation (pediculosis pubis). Scratching can lead to secondary bacterial skin infections. They do not generally transmit diseases, unlike body lice. Benefits: None.

Identified on: 3/1/2026