- A scalp infection with tiny gray bugs called lice
- Lice lay many white eggs (nits) in the hair
Symptoms of Head Lice
- The eggs are easier to see than the lice. Nits (eggs) are tiny white specks attached to hairs. Unlike dandruff or sand, nits can't be shaken off the hair shafts.
- Itching of the scalp is the main symptom.
- A scalp rash may be present. The back of the neck is the favorite area.
- Lice are 1/16-inch (2 mm) long gray-colored bugs. They move quickly and are difficult to see.
- They are the size of a sesame seed.
- The lice feed on blood from the scalp. While the bug is sucking blood, some of its secretions get mixed in. Any scalp rash or bumps is the body's reaction to the bug's saliva.
Lifespan of Lice
- The nits (eggs) hatch into lice in about 1 week.
- Nits (eggs) that are over ½ inch (1 cm) from the scalp are empty egg cases. They are very white in color.
- Off the scalp, nits (eggs) can't survive over 2 weeks.
- Adult lice survive 3 weeks on the scalp or 24 hours off the scalp.
Transmission of Head Lice: Live Lice, Not Nits
- Only live lice can give lice to another child.
- Nits (lice eggs) cannot pass on lice. Nits are attached to the child's hair.
- Almost all spread of lice is from direct hair-to-hair contact. Lice cannot jump or fly to another person's hair.
- The spread of lice from hats, hair brushes or combs is not common. Headphones and other objects also do not usually spread lice.
- Most often, the spread of lice to others occurs at home, not school. Sleepovers and bed-sharing are a major source.