Pubic Louse (Crab Louse)

Natural Habitat

Exclusively found on human bodies, primarily inhabiting coarse hair in the pubic region, although they can occasionally be found in armpits, eyelashes, and facial hair.

Diet & Feeding

Strictly hematophagous, meaning they feed exclusively on human blood several times a day.

Behavior Patterns

They are relatively immobile ectoparasites that cling tightly to hair shafts using their large, crab-like claws. Their life cycle includes egg (nit), nymph, and adult stages, entirely hosted on the human body.

Risks & Benefits

Risks: They cause intense itching (pruritus) due to an allergic reaction to their saliva. Secondary bacterial infections can occur from scratching. They are transmitted primarily through sexual contact but can spread via shared bedding or towels. Benefit: None to humans or the ecosystem.

Identified on: 3/4/2026