Lice

Recognize the signs

Crawling insects

Human lice crawl; they do not jump or fly. Eggs hatch into nymphs, which resemble smaller adults. An itchy scalp alone has many possible explanations.

Eggs versus debris

Nits are attached to hair or, for body lice, clothing fibers. Dandruff and product residue can be mistaken for eggs. Old nits can remain after activity has stopped, so have uncertain findings checked.

Differences that change the decision

A similar-looking organism can need a different response. Compare the evidence and what it changes.

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What else could it be?

Dandruff and hair casts

Loose flakes or material that moves along a hair can resemble nits. Confirm with careful examination before applying a pediculicide.

Fleas

Jumping insects associated with animal resting areas require a different host and environmental plan.

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Scabies or another skin condition

A clinician must assess persistent itching without confirmed lice; household spraying will not resolve a medical diagnosis.

Compare mites ↗

Inspect the right places

1. Make the examination deliberate

   Use good light and a suitable lice comb, following the comb instructions. Save a clear specimen or image for a pharmacist or clinician when unsure. Avoid diagnosing every speck as a nit.

2. Match the site to the suspected kind

   Check clothing seams for suspected body lice, rather than concentrating only on scalp hair. Keep an infestation discussion private and practical; arrange access to clean garments and washing facilities if needed.

Choose a proportionate response

For pesticides, the local product label determines the allowed pest, site, precautions and timing. Check safety and regional guidance.

1. Treat confirmed head lice correctly

   Use a locally authorized treatment suitable for the person's age and health, or the clinician's plan. Follow its exact application and retreatment instructions: products differ in whether they kill eggs. Check household and close contacts and coordinate treatment of those with confirmed active infestation.

2. Address body-louse conditions

   Provide regular bathing and freshly laundered clothing and bedding. Seek healthcare advice for persistent infestation or illness; body lice have different public-health significance from head lice.

3. Handle pubic lice with clinical guidance

   Relevant sexual contacts need evaluation and treatment as advised; avoid sexual contact until treatment is successful. Discuss testing for other sexually transmitted infections. Do not apply ordinary lice products to the eyes or eyelashes.

4. Clean proportionately

   Follow the treatment-specific advice for recently used clothing, bedding, combs and brushes. Routine environmental cleaning is sufficient for head lice; fumigating the building is unnecessary.

Avoid these mistakes

• Do not use household insecticides, agricultural products, kerosene or animal treatments on people.
• Do not combine lice medicines or repeat them early because itching continues; seek advice about diagnosis, application or resistance.
• Do not assume mayonnaise, oils or similar home remedies have established effectiveness.
• Do not exclude a child solely because old nits remain; follow local school and public-health guidance.

Check whether it is working

Prevent a return

• Reduce head-to-head contact during active head-louse management and avoid sharing combs or hair accessories.
• For body lice, reliable access to bathing and clean clothing is a prevention measure, not a matter of blame.
• Discuss close-contact management privately; pets do not need treatment for human lice.

Common questions