Dandruff: Causes, Symptoms, Treatment and Scalp Care

Dandruff is a very common scalp condition that causes visible flakes of dead skin in the hair and sometimes on the shoulders.

The scalp may also feel:

• itchy,
• dry,
• irritated,
• or uncomfortable.

Dandruff is not contagious, and having it does not mean that someone has poor personal hygiene.

Mild dandruff can often be controlled with appropriate hair and scalp care. When ordinary shampoo does not help, a medicated dandruff shampoo may be useful.

More persistent or severe symptoms can sometimes be caused by seborrheic dermatitis or another skin condition, so it is important to know when professional assessment is appropriate.

Is Dandruff the Same as Seborrheic Dermatitis?

They are closely related.

Dandruff is generally considered a mild form of seborrheic dermatitis affecting the scalp.

Seborrheic dermatitis can cause more obvious inflammation and scaling and can occur beyond the scalp.

It commonly affects oily areas such as the:

• scalp,
• eyebrows,
• sides of the nose,
• ears,
• beard or moustache area,
• eyelids,
• and chest.

More extensive seborrheic dermatitis can sometimes affect other skin folds.

Is Dandruff a Form of Psoriasis?

No.

Dandruff/seborrheic dermatitis and psoriasis are different conditions.

However, scalp psoriasis can produce:

• flakes,
• scales,
• itching,
• and inflammation

that may resemble severe dandruff.

Some people can also have features of both psoriasis and seborrheic dermatitis, sometimes referred to as sebopsoriasis.

If the diagnosis is uncertain, a healthcare professional or dermatologist can examine the scalp.

What Does Dandruff Look Like?

Typical dandruff causes visible flakes on the scalp and in the hair.

The flakes may fall onto:

• clothing,
• shoulders,
• bedding,
• or hair-care accessories.

The scalp may also itch.

Seborrheic dermatitis can produce:

• white or yellowish scales,
• greasy-looking patches,
• inflammation,
• itching,
• and areas of skin that appear different in colour from surrounding skin.

Skin inflammation does not look identical on every skin tone.

On lighter skin it may appear red or pink.

On brown or Black skin, affected areas may look:

• darker,
• lighter,
• purple-brown,
• greyish,
• or otherwise different from surrounding skin.

What Causes Dandruff?

There is no single simple cause.

Several factors appear to contribute to dandruff and seborrheic dermatitis.

These include:

• activity of naturally occurring skin yeast,
• scalp oil or sebum,
• individual skin sensitivity,
• hair and scalp-care habits,
• and certain medical or environmental factors.

A yeast called Malassezia normally lives on human skin.

Researchers believe that the interaction between this yeast, skin oils and a person's individual immune or skin response plays an important role in seborrheic dermatitis.

Having Malassezia on your skin is normal and does not mean you have an infection caused by poor cleanliness.

Is Dandruff Caused by Poor Hygiene?

No.

This is one of the most important misconceptions about dandruff.

Dandruff and seborrheic dermatitis are not caused simply by being dirty or failing to bathe.

However, hair-care habits can influence how noticeable dandruff becomes.

For example, infrequent shampooing in someone with an oily scalp can allow:

• oil,
• dead skin,
• and flakes

to accumulate, making dandruff more visible.

That is different from saying poor hygiene causes the condition.

Is Dandruff Contagious?

No.

You cannot normally catch dandruff from another person through:

• touching,
• hugging,
• sitting beside them,
• or ordinary social contact.

Dandruff does not require isolation.

Does Dandruff Cause Head Lice?

No.

Dandruff does not cause head lice.

Head lice are parasitic insects transmitted primarily through direct hair-to-hair contact with someone who has lice.

A person can have dandruff and head lice at the same time, but one does not cause the other.

Who Can Develop Dandruff?

Dandruff is common and can affect many people.

Some people experience only occasional mild flaking, while others have repeated episodes.

Seborrheic dermatitis can occur at different ages.

In infants, a form of seborrheic dermatitis affecting the scalp is commonly called cradle cap.

Adults can experience recurring flare-ups over many years.

What Can Make Dandruff Worse?

Symptoms may fluctuate.

Potential triggers or aggravating factors include:

• stress,
• cold or dry weather,
• oily skin,
• irritating hair-care products,
• and changes in normal scalp care.

Some people notice that symptoms become worse at particular times of year.

Learning your individual triggers can help with long-term control.

Can Stress Cause Dandruff?

Stress is not the sole cause of dandruff, but it may make seborrheic dermatitis flare or become more noticeable in some people.

Managing stress therefore may help some individuals reduce flare-ups, although stress management alone is not a dandruff treatment.

Can Weather Affect Dandruff?

Yes.

Cold, dry weather can aggravate seborrheic dermatitis in some people.

Symptoms may improve or worsen with seasonal changes.

Climate is therefore better viewed as a possible trigger for flare-ups rather than the underlying cause of dandruff.

Does Diet Cause Dandruff?

There is not good evidence that ordinary dandruff is simply caused by eating a “poor diet.”

A nutritious diet remains important for overall health, skin and hair, but people should be cautious about claims that particular foods will cure dandruff.

Unnecessary restrictive diets are not recommended simply because someone has scalp flakes.

What Are the Symptoms of Dandruff?

Common symptoms include:

• visible white or greyish flakes,
• flaky scalp,
• itching,
• mild scalp irritation,
• and flakes visible in the hair or on clothing.

More obvious seborrheic dermatitis can cause:

• greasy scales,
• white or yellowish scaling,
• inflamed skin,
• persistent itching,
• and patches affecting the scalp or other oily areas of the body.

Can Dandruff Affect the Eyebrows or Face?

Ordinary dandruff refers mainly to scalp flaking.

However, seborrheic dermatitis can affect areas outside the scalp, including:

• eyebrows,
• eyelids,
• sides of the nose,
• ears,
• beard,
• moustache area,
• and chest.

Someone with persistent scaling in several of these areas may have seborrheic dermatitis rather than simple scalp dandruff.

Does Dandruff Cause Hair Loss?

Dandruff and seborrheic dermatitis do not normally cause permanent hair loss.

However, severe itching and repeated scratching can irritate or damage the scalp and hair.

If you are experiencing noticeable or unexplained hair loss along with scaling, seek professional assessment because another scalp disorder may be responsible.

What Conditions Can Look Like Dandruff?

Not every flaky or itchy scalp is dandruff.

Similar symptoms can occur with:

• scalp psoriasis,
• eczema,
• contact dermatitis,
• fungal infection of the scalp,
• reactions to hair products,
• and other skin disorders.

Correct diagnosis becomes particularly important when ordinary dandruff treatment does not work.

Can Hair Products Cause an Itchy, Flaky Scalp?

Yes.

Some people develop irritation or contact dermatitis from hair-care products.

Potential triggers can include ingredients in:

• hair dye,
• shampoo,
• conditioner,
• styling products,
• fragrances,
• gels,
• sprays,
• and other products.

Failing to rinse shampoo thoroughly can also irritate the scalp.

If symptoms begin after using a new product, stop using the suspected product and seek advice if the reaction is significant or persists.

How Is Dandruff Treated?

Treatment depends on severity.

Mild dandruff may improve with regular shampooing and appropriate scalp care.

If ordinary shampoo is not enough, a medicated dandruff shampoo may help.

Different shampoos work in different ways.

Some reduce yeast activity, while others help loosen or reduce scales.

What Ingredients Are Found in Dandruff Shampoos?

Depending on the country and product, dandruff shampoos may contain active ingredients such as:

• ketoconazole,
• selenium sulfide,
• zinc pyrithione,
• salicylic acid,
• sulfur,
• or coal tar.

Availability and regulatory approval vary internationally.

Different ingredients address dandruff in different ways, so one product may work better for a particular person than another.

How Should You Use Dandruff Shampoo?

Always follow the instructions for the specific product.

Generally, dandruff shampoo needs to reach the scalp, rather than being applied only to the hair.

Some products need to remain on the scalp for several minutes before being rinsed away.

The required contact time and frequency vary according to:

• the active ingredient,
• product formulation,
• scalp condition,
• and hair type.

Using more than directed does not necessarily improve results and may irritate the scalp.

Hair Type Matters

Hair-care routines should not be identical for everyone.

Someone with:

• straight hair,
• fine hair,
• or a very oily scalp

may wash their hair more frequently.

Someone with:

• curly,
• coily,
• tightly textured,
• or naturally dry hair

may need less frequent shampooing to avoid excessive dryness.

For curly or coily hair, medicated dandruff shampoo can often be concentrated mainly on the scalp, followed by appropriate conditioning of the hair.

The American Academy of Dermatology emphasizes adapting dandruff treatment to hair type rather than recommending the same washing schedule for everyone.

What If One Dandruff Shampoo Stops Working?

Some people find that a particular shampoo becomes less effective over time.

It may help to use or alternate products containing different active ingredients when appropriate.

However, persistent symptoms despite correctly using dandruff shampoo should be medically assessed rather than endlessly switching products.

A dermatologist may determine that the problem is:

• seborrheic dermatitis,
• psoriasis,
• eczema,
• fungal infection,
• contact dermatitis,
• or another condition.

Are Steroid Creams Used for Dandruff?

Topical corticosteroids can sometimes be prescribed for seborrheic dermatitis with significant inflammation.

They can reduce:

• itching,
• inflammation,
• and discoloration.

However, they should not simply be used indefinitely without appropriate guidance.

Incorrect or prolonged use of potent topical steroids can cause side effects.

This is particularly important on sensitive areas such as the:

• face,
• eyelids,
• and skin folds.

Use corticosteroid treatment according to professional or product guidance appropriate to the medication and location.

Can Antifungal Treatment Help?

Yes.

Because Malassezia yeast is believed to play an important role in seborrheic dermatitis, antifungal treatments can reduce symptoms.

Ketoconazole is one commonly used antifungal ingredient.

It may be available in:

• shampoos,
• creams,
• gels,
• foams,
• or other formulations,

depending on the country.

Follow the product instructions or treatment plan provided by a healthcare professional.

How Can You Care for Your Scalp?

A sensible scalp-care routine can help control symptoms.

Wash According to Your Hair and Scalp Needs

There is no universal washing frequency.

Wash often enough to control:

• excess oil,
• product buildup,
• and visible scaling

without unnecessarily drying or irritating your scalp and hair.

Be Gentle

Avoid aggressively:

• scratching,
• scraping,
• or picking scales from the scalp.

This can damage the skin and increase irritation.

Rinse Products Thoroughly

Shampoo or other products left on the scalp can cause irritation in some people.

Rinse thoroughly unless the product instructions specifically say otherwise.

Be Careful With Styling Products

Some:

• hair sprays,
• gels,
• pomades,
• fragranced products,
• and alcohol-containing products

may aggravate sensitive skin.

If a particular product repeatedly triggers symptoms, consider avoiding it.

Should You Put Oil on Dandruff?

Scalp oils are commonly used in many cultures and hair-care routines, particularly for textured hair.

However, dandruff is not simply caused by a lack of scalp oil.

Because seborrheic dermatitis involves oily areas of skin and interactions with Malassezia yeast, adding large amounts of oil is not necessarily a treatment and may aggravate symptoms for some people.

If you have curly or coily hair and need moisture, focus on a hair-care routine that protects the hair while allowing effective treatment of the scalp.

A dermatologist familiar with your hair type can help if standard approaches cause excessive dryness.

Can Dandruff Be Prevented Completely?

Dandruff cannot always be permanently prevented.

It tends to be a recurring condition, meaning symptoms can improve and later return.

The realistic goal is usually to:

• control flakes,
• reduce itching,
• limit inflammation,
• and prevent frequent or severe flare-ups.

Some people continue using an appropriate dandruff shampoo periodically after symptoms improve to help maintain control.

What About Cradle Cap in Babies?

Cradle cap is a form of seborrheic dermatitis that occurs in infants.

It commonly causes greasy or scaly patches on the baby's scalp.

Cradle cap often improves naturally over time.

Do not automatically use adult dandruff shampoos on babies.

Gentle baby shampoo and careful loosening of scales may be appropriate, but seek professional advice if:

• the rash is severe,
• it spreads significantly,
• the skin becomes infected,
• or you are uncertain about treatment.

When Should You See a Healthcare Professional?

Mild dandruff usually does not require medical treatment.

Consider professional assessment if:

• dandruff remains severe despite correctly using appropriate shampoo,
• your scalp becomes very inflamed,
• symptoms are painful,
• there is significant swelling,
• there is pus or fluid,
• thick plaques develop,
• scaling spreads extensively beyond the scalp,
• you experience significant hair loss,
• or you are uncertain whether the condition is actually dandruff.

The old advice to see a doctor whenever dandruff persists for three days is unnecessary.

Dandruff commonly lasts much longer than three days and is often managed initially with appropriate scalp care and dandruff shampoo.

When Could It Be a Scalp Infection?

Seek medical advice if scalp symptoms include:

• painful swelling,
• pus,
• open sores,
• rapidly worsening inflammation,
• patches of significant hair loss,
• swollen lymph nodes,
• or other signs suggesting infection.

A fungal scalp infection such as tinea capitis requires different treatment from ordinary dandruff and may require prescription medication.

The Bottom Line

Dandruff is a common condition that causes flakes of dead skin to shed from the scalp.

It may also cause itching and irritation.

Dandruff is:

• not caused simply by poor hygiene,
• not contagious,
• not caused by head lice,
• not a form of psoriasis,
• and does not cause head lice.

It is generally considered a mild form of seborrheic dermatitis.

Factors involving:

• Malassezia yeast,
• skin oils,
• individual skin response,
• environmental triggers,
• and hair-care practices

can contribute to symptoms.

Many people can control dandruff using appropriate scalp care and medicated shampoos containing ingredients such as ketoconazole, selenium sulfide, zinc pyrithione or salicylic acid, depending on local availability.

Treatment should also take account of hair texture and scalp needs, particularly for people with curly, coily or tightly textured hair.

If dandruff remains severe, causes substantial inflammation or hair loss, or does not respond to appropriate treatment, seek professional assessment to rule out another scalp condition.

Medical Disclaimer

This article provides general health information for an international audience and is not a substitute for diagnosis or treatment from a qualified healthcare professional. Dandruff products, active ingredients, concentrations and age restrictions differ between countries. Follow the instructions supplied with any medicated shampoo or treatment and seek professional advice for severe, persistent or unusual scalp symptoms.

Sources and Further Reading

American Academy of Dermatology — How to Treat Dandruff

https://www.aad.org/public/everyday-care/hair-scalp-care/scalp/treat-dandruff

American Academy of Dermatology — Seborrheic Dermatitis: Causes

https://www.aad.org/public/diseases/a-z/seborrheic-dermatitis-causes

American Academy of Dermatology — Seborrheic Dermatitis: Diagnosis and Treatment

https://www.aad.org/public/diseases/a-z/seborrheic-dermatitis-treatment

American Academy of Dermatology — Seborrheic Dermatitis: Self-Care

https://www.aad.org/public/diseases/a-z/seborrheic-dermatitis-self-care

MedlinePlus — Seborrheic Dermatitis

https://medlineplus.gov/ency/article/000963.htm