Bug Identifier
Pubic louse (or Crab louse)
Community identification

Pubic louse (or Crab louse)

Pthirus pubis

Order & Family
Order: Psocodea (formerly Phthiraptera), Family: Pthiridae
Size
1.1 mm to 1.8 mm (about the size of a pinhead)
See this bug in the Encyclopedia

Natural Habitat

Found primarily in human pubic hair, but can also be found in other coarse body hair like armpits, facial hair, eyelashes, or chest hair.

Diet & Feeding

Obligate hematophage; they feed exclusively on human blood several times a day.

Behavior Patterns

They are slow-moving and cling tightly to hair shafts with specialized crab-like claws. They do not jump or fly and are usually transmitted through close physical contact or shared personal items like towels or bedding.

Risks & Benefits

Risk: Causes intense itching (pruritus) due to an allergic reaction to their saliva. Scratching can lead to secondary bacterial skin infections. They are not known to transmit systemic diseases but are considered a nuisance parasite.