Human Head Louse Egg (Nit)
Scientific Name: Pediculus humanus capitis
Order & Family: Order: Psocodea, Family: Pediculidae
Size: Nits are approximately 0.8 mm by 0.3 mm; adults are 2.1-3.3 mm.
Natural Habitat
The hair shafts of the human scalp, most commonly found behind the ears and at the nape of the neck.
Diet & Feeding
Obligate parasites that feed exclusively on human blood several times a day.
Behavior Patterns
Eggs are glued to individual hair shafts near the scalp to use body heat for incubation; they hatch in 7-10 days into nymphs.
Risks & Benefits
They cause intense itching (pediculosis) and secondary skin infections from scratching; unlike body lice, they are not known vectors of disease.
Identified on: 3/5/2026