Pubic louse

Scientific Name: Pthirus pubis

Order & Family: Order: Psocodea; Family: Pthiridae

Size: 1.1 mm to 1.8 mm

Pubic louse

Natural Habitat

Coarse human body hair, primarily in the pubic region, but also eyelashes, eyebrows, armpits, or chests.

Diet & Feeding

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

Behavior Patterns

Slow-moving; attaches firmly to hair shafts with specialized claws. They cannot jump or fly and are usually transmitted through close physical contact.

Risks & Benefits

Causes intense itching (pruritus) due to an allergic reaction to saliva; can lead to secondary skin infections from scratching. No known benefits; strictly a parasite.

Identified on: 1/11/2026