Bug Identifier
Pubic Louse (Crab Louse)
Community identification

Pubic Louse (Crab Louse)

Pthirus pubis

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

Natural Habitat

Human body hair, most commonly in the pubic region, but can also be found in eyelashes, eyebrows, armpits, or chest hair.

Diet & Feeding

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

Behavior Patterns

Crawls from person to person through close physical contact; cannot jump or fly. They cling to hair shafts and lay eggs (nits) at the base of the hair.

Risks & Benefits

Risks include intense itching (pruitus) caused by an allergic reaction to their saliva, and secondary skin infections from scratching. They do not transmit diseases but are a public health nuisance and signify the need for medical treatment.