Pubic Louse (Crab Louse) - Tentative identification due to image quality
Scientific Name: Pthirus pubis
Order & Family: Order: Phthiraptera, Family: Pthiridae
Size: Minute size; typically 1.5 mm to 2 mm in length (less than 1/8 inch), slightly smaller than head or body lice.
Natural Habitat
Exclusively inhabits coarse human body hair (pubic region, chest hair, eyelashes, eyebrows, beard, armpits). They are obligate ectoparasites and cannot survive long away from a host.
Diet & Feeding
Hematophagous (feeds exclusively on human blood). They anchor themselves to hair shafts and feed on the host's skin multiple times a day.
Behavior Patterns
These lice are less mobile than head lice. They attach firmly to two hair shafts using their large claws (giving them a crab-like appearance) and remain relatively stationary. They complete their entire life cycle (egg/nit, three nymph stages, adult) on the host.
Risks & Benefits
Risks: Causes intense itching (pruritus) due to an allergic reaction to saliva; scratching can lead to secondary bacterial skin infections. Can be socially stigmatizing. Benefits: None; they are parasitic pests.
Identified on: 2/10/2026