Human Head Louse
Scientific Name: Pediculus humanus capitis
Order & Family: Order: Psocodea; Family: Pediculidae
Size: 2.0 mm to 3.0 mm (about the size of a sesame seed)
Natural Habitat
The human scalp, primarily near the ears and the nape of the neck
Diet & Feeding
Exclusively human blood, consumed by piercing the skin several times a day
Behavior Patterns
Obligate ectoparasites that cannot jump or fly; they crawl quickly from hair to hair. Eggs (nits) are glued to the base of hair shafts.
Risks & Benefits
Causes intense itching and social distress. They do not transmit diseases, though secondary bacterial infections can occur from scratching.
Identified on: 12/28/2025