Human Head Louse Egg (Nit)
Scientific Name: Pediculus humanus capitis
Order & Family: Order: Psocodea, Family: Pediculidae
Size: Approximately 0.8 mm long (about the size of a knot in thread).
Natural Habitat
The hair shafts of human hosts, primarily found within 1/4 inch of the scalp for warmth and humidity.
Diet & Feeding
Egg stage does not feed; adults feed exclusively on human blood several times a day.
Behavior Patterns
Eggs are glued to individual hair shafts with a waterproof cementing substance; they hatch in 7 to 10 days.
Risks & Benefits
Causes scalp itching and social distress; not known to spread disease but can lead to secondary infections from scratching.
Identified on: 5/15/2026