Lice Vs. Dandruff: Differences, Pictures, And Symptoms

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How to tell the difference between lice and dandruff

Medically reviewed by Alana Biggers, M.D., MPH — Written by Zawn Villines — Updated on July 27, 2023

Lice vs. dandruff
Pictures
Symptoms of dandruff
Symptoms of lice
Treatment
Prevention
Takeaway

Lice are easy to confuse with dandruff. While lice are a temporary infestation, dandruff is a chronic skin condition.

Every year, 6 to 12 million people in the United States get head lice. Most are children ages 3 to 12 years old.

Both lice and dandruff are usually treatable at home. Distinguishing one from the other can help a person choose the right treatment.

Lice vs. dandruff

Doctor inspecting a girls scalp to determine if it's lice or dandruff — Dandruff flakes from the scalp, but nits stick to the hair.

Dandruff, also known as seborrheic dermatitis, is a skin condition that causes the top layer of skin to shed too quickly. This shedding produces a dry, flaky, itchy scalp. People with dandruff may also notice flakes of skin on their clothes.

Yeast causes some types of dandruff that tend to be particularly itchy.

Lice are parasites that live on the scalp and eat human blood. Lice can cause intense itching.

Head lice do not spread diseases, but they are highly contagious. Close contact with the head or hair of a person with lice — such as from sharing hairbrushes or giving hugs — can spread the infestation.

Young children often hug or touch each other, and so head lice are more common in kids than adults and families with kids.

Some important differences between lice and dandruff include:

Location: Lice lay eggs called nits while dandruff causes flaky skin. The two look similar, but close inspection reveals key differences. Nits stick to the hair while dandruff flakes, easily falling off of hair. While dandruff is visible on the scalp, lice lay eggs on hair, not the scalp.
Contagion: Dandruff is not contagious, but lice spread easily from person to person. If a classmate, friend, or family member has recently had lice, lice could be the reason why a person develops an itchy scalp.
Itching: Dandruff and lice both itch. Dandruff tends to itch more when the scalp is dry. People with lice may feel a crawling sensation on their scalp.
Lymph nodes: Lice can cause bacterial infections, especially when a person scratches their scalp too hard and causes bleeding. Some people with lice notice that the lymph nodes on their neck or behind their ears feel swollen
Color: Lice are tiny, and people may need a magnifying glass to see them. If a person notices bugs or black or brown spots on the scalp or in the hair, this usually means they have lice, not dandruff.

Pictures

Symptoms of dandruff

Some people with dandruff develop seborrheic dermatitis on other areas of their body. When this happens, a person might notice flaking or scaly skin on the face, chest, neck, or ears. These areas may be dry, red, and painful or itchy.

Most people, however, experience a mild form of dandruff only on the scalp. Symptoms of dandruff include:

flaky skin that is either very oily or very dry
white or yellowish flakes on clothes
an itchy scalp
red patches on the scalp
symptoms that worsen in the winter or dry weather

Some people with dandruff notice temporary hair loss, but hair loss is more typical of other conditions.

Symptoms of lice

Lice are much more common among children and people in close contact with children, such as teachers, parents, daycare workers, and babysitters.

Signs and symptoms of lice include:

intense itching on the scalp
constantly scratching the head
red or bloody spots on the scalp from scratching
swollen lymph nodes
teardrop-shaped lice eggs on the hair
tiny black spots on the scalp or in the hair

Treatment

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A person should wash clothes and bed sheets at 130°F or hotter if they used them 2 days prior to lice treatment.

A range of insecticidal shampoos can kill lice, sometimes with just one treatment. It is also vital to comb nits out of the hair. People should follow the procedure on the shampoo packaging.

Over-the-counter (OTC) lice remedies work well, but some lice are resistant to these medicines. So if the first treatment does not work, a person may want to see a doctor for an alternative prescription remedy.

Lice remedies are available at pharmacies and online.

Head lice cannot live for long without a host. Washing items that make it easy for lice to hop back onto a person can reduce the spread of these bugs.

The Centers for Disease Control and Prevention (CDC) recommend:

Washing clothing, bed sheets, and other items in water of 130°F or hotter.
Soaking brushes and combs in 130°F water for at least 5–10 minutes.
Vacuuming all carpets and rugs in the home.
Avoiding using insecticidal sprays or other poisons.

Dandruff often responds well to OTC anti-dandruff shampoos. People can purchase these shampoos in drugstores or online.

The American Academy of Dermatology recommend shampooing with an anti-dandruff shampoo twice a week unless a person is African-American.

African-Americans tend to have drier hair and scalps, so they may be better off shampooing with anti-dandruff shampoo only once per week.

People with light-colored hair should avoid shampoos with coal tar since this can change hair color.

Some people find that their dandruff does not get better with an anti-dandruff shampoo. If symptoms do not improve, the flakes may be due to a yeast infection on the scalp, an autoimmune condition, eczema, or a severe case of dandruff.

A dermatologist can help someone identify the underlying cause, as well as any triggers. Some people may need prescription anti-dandruff shampoos.

Prevention

Dandruff is common and difficult to prevent. Regularly washing the hair reduces dandruff in some people, but lack of hygiene does not cause dandruff.

People with dandruff can try to identify triggers, such as cold or dry air. People with particularly dry scalps sometimes get relief from sleeping with a humidifier.

To prevent lice, avoid close contact with people at high risk of lice, especially very young children. Avoid sharing combs, brushes, pillows, and other items where lice may hide.

If a person in the family has lice, treat them and other family members for lice.

Takeaway

Neither having lice or dandruff is dangerous. Constant scratching can injure the scalp, however, and may lead to a scalp infection.

Both lice and dandruff usually respond well to store-bought treatments, and so a person can try an OTC remedy as their first response.

If OTC treatments do not work, it is best to see a doctor or dermatologist for scalp itching or pain.

Dermatology
Atopic Dermatitis / Eczema
Pediatrics / Children's Health

How we reviewed this article:

SourcesMedical News Today has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical journals and associations. We only use quality, credible sources to ensure content accuracy and integrity. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.

Borda, L. J., & Wikramanayake, T. C. (2016, May 2). Seborrheic dermatitis and dandruff: A comprehensive review. Journal of Clinical and Investigative Dermatology, 3(2)https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4852869/
Dandruff: How to treat. (n.d.)https://www.aad.org/public/skin-hair-nails/hair-care/how-to-treat-dandruff
Epidemiology & risk factors. (2013, September 24)https://www.cdc.gov/parasites/lice/head/epi.html
Frankowski, B. L., & Bocchini, J. A. (2010, August). Head lice [Abstract]. Pediatrics, 126(2), 392–403https://www.ncbi.nlm.nih.gov/pubmed/20660553
Head lice. (n.d.)https://www.aad.org/public/diseases/contagious-skin-diseases/head-lice
Ranganathan, S., & Mukhopadhyay, T. (2010, April–June). Dandruff: The most commercially exploited skin disease. Indian Journal of Dermatology, 55(2), 130–134https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2887514/
Treatment. (2016, August 19)https://www.cdc.gov/parasites/lice/head/treatment.html

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Medically reviewed by Alana Biggers, M.D., MPH — Written by Zawn Villines — Updated on July 27, 2023

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