Nursing care
Head Lice nursing care: what to assess and what to do first
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Head lice, or pediculosis capitis, is a highly contagious infestation of the scalp by tiny parasitic insects spread through direct head-to-head contact or shared personal items. Nursing care centres on confirming live infestation, applying pediculicide treatment, combing out nits, retreating after seven to ten days, and decontaminating bedding and clothing in hot water.
The pathophysiology in one pass
Head lice are small wingless insects that live on the scalp, feeding on blood and laying eggs, called nits, that they cement to individual hair shafts close to the scalp surface. The itching that brings most families in isn't an immediate reaction; it's a delayed hypersensitivity response to louse saliva, which means a child can be infested for weeks before scratching starts.
Lice cannot jump or fly. They spread through direct head-to-head contact and, less commonly, through shared hats, combs, brushes, headphones, and pillows. They survive only a short time off the scalp, which is why environmental decontamination matters but doesn't need to be exhaustive. Infestation is common in school-age children regardless of hygiene or household cleanliness, and that point is worth stating plainly to families who feel stigmatised by a diagnosis.
Assessment findings that matter
Inspect the scalp systematically, section by section, starting behind the ears and at the nape of the neck where lice and nits are most often found first. Look for live lice, which move quickly and are harder to spot, and for nits, which are firmly attached to the hair shaft rather than loose like dandruff flakes.
The distance of the nit from the scalp tells you whether it's an active concern: nits found within a quarter inch of the scalp are considered viable and likely to hatch, while nits further out along the hair shaft represent old, non-viable cases that have simply grown out with hair growth. Ask about itching duration, recent close contact with other children, and any prior treatment already attempted, since a poor response to a first treatment changes the plan. Check for secondary excoriation or signs of bacterial infection from scratching.
What the exam asks about this
NCLEX questions on head lice typically test two things: correct identification of a live infestation versus old nit casings, and the correct sequence of treatment and retreatment. Expect a scenario asking you to interpret an assessment finding, such as nits close to the scalp, and choose the appropriate next action rather than simply naming the diagnosis.
You may also be tested on infection control and family education priorities: which measures actually prevent spread, such as avoiding head-to-head contact and washing recently used bedding, versus measures that overreach, such as fumigating a whole house. A question may present a family declining treatment due to stigma or misinformation, testing whether you can respond with accurate, non-judgmental education rather than reinforcing shame.
Nursing interventions in priority order
Confirm the diagnosis first through direct visual inspection before starting treatment, since not every itchy scalp is lice. Once confirmed, apply the prescribed pediculicide exactly per its instructions, since efficacy depends on correct contact time and application to dry hair or scalp as directed by the specific product.
After treatment, comb out remaining nits and any surviving lice with a fine-toothed nit comb, working in sections, since chemical treatment alone doesn't reliably remove every egg. Schedule a retreatment at seven to ten days regardless of how clean the scalp looks after the first round, because this second application catches any lice that hatched from eggs the first treatment didn't kill. Advise washing recently worn clothing, hats, and bedding in hot water and drying on high heat, or sealing non-washable items in a plastic bag for a couple of weeks.
Medications and monitoring
First-line treatment is typically an over-the-counter permethrin-based product, with prescription options such as malathion or spinosad reserved for resistant or persistent cases. Reinforce that treatment failure is often due to incorrect application or skipping the retreatment step, not necessarily resistance, so review technique before assuming the medication has failed.
Monitor the scalp at the retreatment visit for any new live lice or fresh nits close to the scalp, which would indicate ongoing infestation needing a different agent. Watch for skin irritation from the pediculicide itself, and check for secondary infection at excoriated sites from prolonged scratching, which may need a topical or oral antibiotic if present.
When to escalate
Escalate to a prescriber for a different medication class if lice are still active after a correctly applied first-line treatment and a proper retreatment cycle, since this suggests resistance rather than a technique problem. Escalate also if there's evidence of secondary bacterial infection at scratched sites, such as spreading redness, warmth, or drainage.
Refer families back to school or public health guidance if there's concern about an outbreak spreading through a classroom, since some schools coordinate notification. There's rarely a clinical reason to exclude a child from school for lice alone once treatment has started, so avoid reinforcing unnecessary exclusion policies that aren't evidence-based, and instead focus the family on completing the treatment and retreatment schedule correctly.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our pediatrics practice questions are the closest set to what this page covers.
Common questions
How do you tell if a nit is dead or alive?
Nits found within about a quarter inch of the scalp are considered viable and likely to hatch. Nits further along the hair shaft represent old cases that have grown out with the hair and are no longer a concern.
Why is a second lice treatment needed a week later?
The first treatment kills active lice but doesn't always kill every egg. Retreating at seven to ten days catches any lice that hatched after the first application, before they can lay new eggs.
Can head lice jump from one person to another?
No, lice cannot jump or fly. They spread through direct head-to-head contact and, less often, through sharing items like hats, combs, and pillows.
Does a child need to stay home from school with head lice?
Policies vary by school and district, but there is generally no strong clinical reason to exclude a child once treatment has begun. Families should check their specific school's policy while focusing on completing the treatment and retreatment schedule correctly.