Seborrheic dermatitis is a chronic condition that affects the scalp. It causes redness, flaking, and itching. Finding the right hair washing frequency is a big challenge.

Daily hair washing might seem like a good idea to ease symptoms. But, it can have both good and bad effects. Studies show that washing too little or too much can upset the scalp’s natural balance.

We will look into how often you should wash your hair. We’ll also find the best ways to manage seborrheic dermatitis. This way, you can keep your scalp healthy without making things worse.

Key Takeaways

• Daily hair washing can have both positive and negative effects on seborrheic dermatitis.
• The scalp’s natural balance and microbiome can be disrupted by both under-washing and over-washing.
• Finding the right washing frequency is key to managing symptoms.
• Recent research offers insights into the best scalp cleansing practices.
• Keeping a healthy scalp means finding a balance between cleanliness and preserving natural oils.

What Is Seborrheic Dermatitis and How Does It Affect Your Scalp?

Knowing about seborrheic dermatitis is key to managing its symptoms and improving scalp health. It’s a chronic skin condition that mainly hits the scalp. It causes discomfort and distress for those who have it.

Seborrheic dermatitis shows up as flaking, redness, and itching. It’s more than just dandruff. It’s a complex mix of sebum, microbes, and how our bodies react to them.

Clinical Definition and Prevalence

Seborrheic dermatitis is a chronic skin issue that mainly affects areas with lots of sebaceous glands, like the scalp. It’s found in a big chunk of the world’s population. The exact number varies in different studies.

The exact cause is not fully known. But it’s thought to be a mix of genetics, hormones, and the environment. Malassezia yeasts, a fungus on our skin, are believed to be a big part of it.

Common Symptoms and Their Severity

The symptoms of seborrheic dermatitis can range from mild to severe. They can include flaking, redness, itching, and oily patches on the scalp. The severity can change over time, influenced by stress, seasons, and how we take care of ourselves.

Areas Most Commonly Affected Beyond the Scalp

While the scalp is most hit, seborrheic dermatitis can also affect other oily areas. These include:

• Face, specially the eyebrows and nasolabial folds
• Ears and the external auditory canal
• Chest and back

Knowing how seborrheic dermatitis affects more than just the scalp is key to treating it fully.

The Science Behind Seborrheic Dermatitis

Seborrheic dermatitis is a chronic skin condition. It causes inflammation, flaking, and redness, mainly on the scalp. This happens because of Malassezia yeasts, sebum, and the scalp’s inflammatory response.

The Role of Malassezia Yeasts in Triggering Symptoms

Malassezia yeasts live on human skin, mostly in oily areas. They turn sebum triglycerides into fatty acids. These fatty acids can irritate the skin, causing inflammation and flaking.

People with seborrheic dermatitis often have more Malassezia yeasts on their scalp. The exact way these yeasts cause symptoms is complex. It depends on how the body reacts and individual immune responses.

Sebum Production and Its Effects on Scalp Health

Sebum is an oily substance that helps moisturize and protect the skin. But, too much sebum can make it easier for Malassezia yeasts to grow. This is a problem for those prone to seborrheic dermatitis.

The mix of sebum and Malassezia yeasts is key to understanding seborrheic dermatitis. Knowing this helps in finding better ways to manage the condition.

Factor	Role in Seborrheic Dermatitis	Effect on Scalp Health
Malassezia Yeasts	Metabolize triglycerides into irritant fatty acids	Contributes to inflammation and flaking
Sebum Production	Creates an environment for Malassezia yeasts to thrive	Excessive sebum can exacerbate symptoms
Inflammatory Response	Individual immune response to Malassezia and sebum	Results in inflammation, redness, and discomfort

The Inflammatory Cascade in Seborrheic Dermatitis

The inflammatory cascade in seborrheic dermatitis is complex. It involves immune cells, cytokines, and other inflammatory mediators. When Malassezia yeasts break down sebum, it can start an immune response, leading to inflammation.

This response includes the release of cytokines and chemokines. These attract immune cells, making the condition worse. Understanding this cascade is key to finding effective treatments.

By looking into Malassezia yeasts, sebum, and the inflammatory cascade, we can grasp the science behind seborrheic dermatitis. This knowledge helps in finding ways to manage and reduce its symptoms.

The Relationship Between Hair Washing and Seborrheic Dermatitis

The link between how often we wash our hair and seborrheic dermatitis is complex. It involves the balance of the scalp’s microbiome. This condition affects millions, causing discomfort and distress. It’s important to manage its symptoms for a better quality of life.

How Cleansing Affects Scalp Microbiome

Washing our scalp can change the balance of microorganisms. The scalp has many microorganisms, including Malassezia yeasts. These yeasts can trigger symptoms of seborrheic dermatitis. Washing regularly can control these yeasts, possibly reducing symptoms.

But, washing too much can upset the scalp’s natural balance. This can cause irritation and dryness.

A study in the Journal of Clinical and Aesthetic Dermatology found medicated shampoos can help. They reduce Malassezia yeast, which is good for managing seborrheic dermatitis. This shows the importance of picking the right shampoo and how often to wash.

Recent Research on Washing Frequency and Symptom Management

Recent studies have found the best washing frequency for seborrheic dermatitis. A study in the Journal of Dermatology found washing hair three times a week is often best. It keeps the scalp clean without upsetting its natural environment.

But, the best frequency can vary. It depends on hair type, lifestyle, and how severe the symptoms are.

• For mild cases: Washing 1-3 times a week may be enough.
• For moderate symptoms: Washing 3-5 times a week can help more.
• For severe flare-ups: Daily washing with medicated shampoo might be needed. But, always do this under a doctor’s advice.

The Balance Between Under-Washing and Over-Washing

Finding the right balance is key. Washing too little can lead to buildup, making symptoms worse. Washing too much can dry out the scalp, causing irritation.

It’s important to adjust washing frequency based on individual needs. Using gentle shampoos and being careful with washing technique can help. For some, medicated shampoos can offer extra benefits.

Benefits of Daily Hair Washing for Seborrheic Dermatitis Sufferers

For those with seborrheic dermatitis, washing hair daily is very helpful. It tackles the main causes and symptoms of the condition.

Removal of Excess Sebum and Scale Buildup

Washing hair daily removes extra sebum and scale from the scalp. Seborrheic dermatitis makes too much sebum, causing flakes and scales. Regular washing:

• Reduces flakes and scales
• Prevents sebum buildup, which worsens the condition
• Keeps the scalp clean and lowers irritation

Control of Malassezia Yeast Population

Daily hair washing also controls Malassezia yeast on the scalp. Malassezia yeast is on human skin and can cause seborrheic dermatitis. By washing the scalp often, people can:

• Lower Malassezia yeast amount
• Lessen the chance of yeast-related flare-ups
• Keep the scalp’s microbiome healthy

Benefits	Description
Removal of Excess Sebum	Reduces flakes and scales, prevents sebum buildup, and keeps the scalp clean
Control of Malassezia Yeast	Reduces yeast population, minimizes flare-up risk, and maintains a healthy scalp microbiome
Reduction of Inflammatory Triggers	Decreases irritation, reduces redness, and promotes a healthier scalp environment

Reduction of Inflammatory Triggers and Irritants

Also, daily hair washing reduces inflammatory triggers and irritants of seborrheic dermatitis. A clean scalp:

• Lessens irritation and discomfort
• Reduces redness and inflammation
• Creates a healthier scalp environment

In summary, daily hair washing is key for managing seborrheic dermatitis. It removes sebum and scale, controls yeast, and lowers inflammation. This improves symptoms and scalp health.

Potential Drawbacks of Washing Your Hair Every Day

Washing your hair daily might seem good for seborrheic dermatitis. But, it’s important to think about the downsides. This condition makes the scalp flaky, red, and itchy. How often you wash your hair can make it worse.

Risk of Scalp Dryness and Increased Irritation

Washing your hair every day can take away the scalp’s natural oils. This can make the scalp dry and more irritated. Using a gentle, moisturizing shampoo can help lessen this risk.

A study in the Journal of Clinical and Aesthetic Dermatology showed a difference. People with seborrheic dermatitis who used moisturizing shampoo had fewer symptoms than those with regular shampoo.

Disruption of Natural Moisture Balance

Washing your hair daily can mess with the scalp’s natural moisture balance. The scalp has a delicate balance that can be upset by too much washing. This can cause the scalp to make too much sebum, making symptoms worse.

“The scalp’s natural barrier function is key for healthy skin. Washing too much can damage this barrier, leading to more sensitivity and irritation.” – A Dermatologist

Considerations for Hair Texture and Integrity

How often you wash your hair can also affect your hair’s texture and strength. Washing daily can make hair brittle and more likely to break, which is bad for dry or damaged hair. Using a conditioner or a hair mask once or twice a week can help keep hair healthy.

Hair Type	Daily Washing Impact	Recommended Care
Dry or Damaged	Increased risk of breakage	Use a moisturizing conditioner or hair mask weekly
Oily	Potential for over-production of sebum	Use a gentle, oil-controlling shampoo
Normal	Risk of dryness and irritation	Balance washing frequency with moisturizing products

In conclusion, while daily hair washing can help with seborrheic dermatitis, it’s important to know the downsides. These include scalp dryness, disrupted moisture balance, and hair texture and integrity issues. Understanding these can help you make better choices for your hair care.

Tailoring Hair Washing Frequency Based on Seborrheic Dermatitis Severity

Knowing how often to wash your hair depends on how bad your seborrheic dermatitis is. This condition can vary from person to person. The severity of it helps decide how often you should wash your hair.

Guidelines for Mild Cases

If you have mild seborrheic dermatitis, washing your hair 1-3 times a week is usually enough. This keeps your scalp healthy without drying it out. Choose a gentle shampoo that doesn’t have harsh chemicals.

Recommendations for Moderate Symptoms

For those with moderate symptoms, washing your hair 3-5 times a week might be better. This helps control the buildup of scales and reduces inflammation. Using a medicated shampoo with ketoconazole or zinc pyrithione can help manage symptoms.

Protocols for Severe Flare-Ups

During severe flare-ups, you might need to wash your hair every day or as advised by a doctor. This helps get rid of extra sebum and scales, which can reduce inflammation and discomfort. Always use a gentle, medicated shampoo and moisturize your scalp afterward to keep it from getting dry.

Remember, adjusting how often you wash your hair is just part of treating seborrheic dermatitis. Getting advice from a dermatologist is key. They can give you a plan that fits your specific situation.

Medicated Shampoos and Their Role in Managing Seborrheic Dermatitis

Medicated shampoos can change the game for those with seborrheic dermatitis. They are made to tackle the condition’s challenges like inflammation, flaking, and fungal infections.

Ketoconazole Shampoo: Usage and Efficacy

Ketoconazole shampoo fights yeast on the scalp, helping to treat seborrheic dermatitis. It’s an antifungal that reduces yeast growth.

Coal Tar and Salicylic Acid Formulations

Coal tar slows down scalp skin cell growth, cutting down flaking and inflammation. Salicylic acid helps remove scales and flakes, making it easier to manage the condition.

Zinc Pyrithione Products (Including Head & Shoulders)

Zinc pyrithione is in many anti-dandruff shampoos, like Head & Shoulders. It has antifungal and antibacterial properties, controlling seborrheic dermatitis symptoms.

Selenium Sulfide Options (Like Selsun Blue)

Selenium sulfide slows down scalp yeast growth, reducing flaking and inflammation. It’s found in shampoos like Selsun Blue.

Active Ingredient	Primary Use	Notable Brands
Ketoconazole	Antifungal	Nizoral
Coal Tar & Salicylic Acid	Reduce flaking & inflammation	Neutrogena T/Gel
Zinc Pyrithione	Antifungal & antibacterial	Head & Shoulders
Selenium Sulfide	Antifungal	Selsun Blue

In conclusion, medicated shampoos are key in managing seborrheic dermatitis. Knowing the different types and their ingredients helps in choosing the right treatment.

Natural and Gentle Cleansing Alternatives for Sensitive Scalps

For those with sensitive scalps, looking into natural and gentle cleansers is key. These options help reduce irritation and keep the scalp healthy.

Tea Tree Oil Shampoos: Benefits and Limitations

Tea tree oil shampoos are popular for their antifungal and antibacterial properties. They help control the yeast that causes seborrheic dermatitis. The active compound, melaleuca alternifolia, fights inflammation and infections.

Benefits: Tea tree oil can cut down on dandruff and flakes. It soothes itching and promotes a healthier scalp.

Limitations: Some people might find tea tree oil irritating, even in small amounts. Start with a little and watch for any bad reactions.

Baby Shampoo: When It’s Appropriate

Baby shampoos are made to be gentle and non-irritating. They’re good for sensitive scalps because they lack harsh chemicals and fragrances.

Key Considerations: Baby shampoos are gentle but might not get rid of stubborn flakes or scale. Think about how gentle it is versus how well it cleanses.

Sulfate-Free and Fragrance-Free Options

Sulfate-free and fragrance-free shampoos are less likely to irritate sensitive scalps. Sulfates can dry out the scalp, and fragrances can cause allergic reactions.

Cleansing Option	Benefits	Considerations
Tea Tree Oil Shampoos	Antifungal, antibacterial, reduces inflammation	Potential irritation, concentration sensitivity
Baby Shampoo	Gentle, non-irritating	May not effectively remove flakes or scale
Sulfate-Free and Fragrance-Free Shampoos	Minimizes irritation, gentle on scalp	May not be as effective in cleansing, potentially build up

Choosing the right cleanser depends on the scalp’s condition, the severity of seborrheic dermatitis, and personal preferences. Think about what ingredients and formulations work best for you.

Proper Hair Washing Techniques for Effective Seborrheic Dermatitis Management

The right way to wash your hair can really help with seborrheic dermatitis. It’s important to clean well to get rid of scales and reduce inflammation. This also helps control the yeast on your scalp.

Optimal Water Temperature Considerations

The water temperature when washing your hair is key. Warm water is best because it opens up the hair follicles and loosens scales. It also doesn’t take away the scalp’s natural oils. Hot water can dry out and irritate the scalp, while cold water might not remove scales and oil well.

A study on the National Center for Biotechnology Information (NCBI) shows that good scalp care is very important for managing seborrheic dermatitis.

Massage Techniques for Thorough Cleansing Without Irritation

Using gentle massage techniques is key for cleaning without irritation. Use your fingertips to massage your scalp in a circular motion. This helps loosen scales and improves blood flow. Don’t use your nails or scrub hard, as it can irritate the scalp and make symptoms worse.

A gentle, soothing massage can also help reduce stress and promote relaxation. This is good for your scalp’s health.

Contact Time Requirements for Medicated Products

When using medicated shampoos, it’s important to follow the recommended contact time. Leave the shampoo on for the recommended duration, usually 5-10 minutes, before rinsing. This lets the active ingredients work deep into the scalp to target the causes of seborrheic dermatitis.

Always follow the product instructions and talk to your dermatologist if you have any questions or concerns.

By using these proper hair washing techniques every day, you can improve your seborrheic dermatitis management plan. This will help keep your scalp healthy.

How Different Hair Types Affect Seborrheic Dermatitis Washing Protocols

Knowing your hair type is key to finding the right way to wash it for seborrheic dermatitis. Each hair type has its own challenges. A single method doesn’t work for everyone.

Recommendations for Fine or Thin Hair

People with fine or thin hair need to find a balance. Daily washing helps prevent oil buildup, which can make seborrheic dermatitis worse. But, use a gentle, sulfate-free shampoo to keep the scalp moist.

Dermatologists say fine hair needs a careful balance. It’s about keeping it clean without losing natural oils.

Approaches for Thick or Coarse Hair Textures

Thick or coarse hair often needs a stronger cleaning. Medicated shampoo with ketoconazole or zinc pyrithione can help. But, don’t forget to use a moisturizing conditioner to avoid dryness.

Special Considerations for Curly or Textured Hair

Curly or textured hair needs special care. It’s drier and more likely to break. Use a gentle, sulfate-free cleanser and a hydrating conditioner. Avoid heat styling and dry with a microfiber towel or old t-shirt.

“Curly hair needs extra moisture to combat dryness and irritation associated with seborrheic dermatitis.”

Adaptations for Color-Treated or Chemically Processed Hair

Color-treated or chemically processed hair needs special care. Choose shampoos that fight seborrheic dermatitis but are gentle on hair. Color-protecting shampoo that’s also medicated is a good choice. Regular conditioning keeps hair healthy.

Post-Wash Care Strategies for Seborrheic Dermatitis

After washing, the scalp is very sensitive. The care it gets can greatly affect the condition. It’s important to keep the scalp healthy.

Gentle Drying Methods to Prevent Irritation

Gentle drying is key to avoid irritation and prevent flare-ups. Instead of rubbing hard, gently pat the scalp dry with a towel. This reduces irritation.

• Use a microfiber towel or an old t-shirt to gently blot excess water.
• Avoid using regular towels that can cause friction.
• If you prefer using a hair dryer, use it on a low or cool setting to prevent overheating the scalp.

Scalp Moisturizing Options and Techniques

Moisturizing the scalp is vital after washing. The right moisturizer can soothe, reduce inflammation, and prevent dryness.

Moisturizer Type	Benefits	Precautions
Coconut Oil	Soothes and hydrates the scalp	May not be suitable for all skin types; can cause comedones in acne-prone individuals
Tea Tree Oil	Antifungal and antibacterial properties	Must be diluted; can cause irritation if used undiluted
Salicylic Acid	Exfoliates and helps remove scales	Can cause dryness; start with lower concentrations

Leave-In Treatments Compatible with Seborrheic Dermatitis

Leave-in treatments offer extra benefits for managing seborrheic dermatitis. They can control symptoms, reduce inflammation, and improve scalp health.

Key Considerations:

• Choose products that are fragrance-free and hypoallergenic to minimize the risk of irritation.
• Look for products containing ingredients like zinc pyrithione or ketoconazole, which have antifungal properties.
• Apply leave-in treatments sparingly to avoid clogging pores or causing buildup.

By following these post-wash care strategies, you can manage seborrheic dermatitis better. This will improve your scalp health overall.

Beyond Washing: Complementary Treatments for Seborrheic Dermatitis

Managing seborrheic dermatitis needs more than just washing your hair. Regular cleansing is key, but other treatments can help a lot. They can make you feel better and control symptoms better.

Topical Corticosteroids

Topical corticosteroids, like desonide cream, help reduce inflammation and scaling. They work by calming down the immune system. This makes the skin less red and less irritated. Always follow your dermatologist’s advice on how to use them.

Key considerations for topical corticosteroid use:

• Start with a low potency steroid for mild cases
• Use higher potency steroids for more severe flare-ups under dermatological supervision
• Be aware of possible side effects, like skin thinning with long-term use

Calcineurin Inhibitors

Calcineurin inhibitors, like tacrolimus ointment, are another option. They reduce inflammation without the usual side effects of steroids. They’re good for sensitive areas or long-term treatment.

Benefits of calcineurin inhibitors include:

• Less risk of skin thinning compared to long-term steroid use
• Good for sensitive skin areas, like the face and neck
• Can be used with other treatments for better results

Prescription-Strength Antifungal Options

If a fungal infection is thought to be part of the problem, stronger antifungal treatments might be needed. These can be stronger versions of over-the-counter shampoos or oral medications. The goal is to control the yeast on the scalp, reducing inflammation and scaling.

Examples of prescription-strength antifungal options:

• Oral antifungal medications for severe or widespread cases
• Prescription antifungal shampoos with ingredients like ketoconazole

Emerging Therapies and Research Directions

New treatments for seborrheic dermatitis are being researched all the time. These might include new antifungal agents, anti-inflammatory drugs, and other targeted therapies. They aim to tackle specific parts of the condition’s cause.

Potential future directions in seborrheic dermatitis treatment:

• Targeted therapies against specific inflammatory pathways
• Probiotics or prebiotics to change the scalp microbiome
• Advanced topical formulations for better delivery and effect

Common Myths About Hair Washing and Seborrheic Dermatitis

Many myths surround hair washing and seborrheic dermatitis. These myths can confuse and hinder treatment for those with this condition. We will look at and debunk some common myths about hair washing and seborrheic dermatitis.

Debunking the “Washing Less Trains Your Scalp” Myth

One myth is that less hair washing makes your scalp less oily or flaky. But, there’s no science backing this up. Seborrheic dermatitis is caused by genetics, hormonal changes, and Malassezia yeasts. Washing less might not solve the problem and could make it worse.

Addressing Concerns About Shampoo Dependency

Some worry that using medicated shampoos too often can make them dependent. While certain ingredients can irritate or dry out your scalp, dependency is not the issue. Medicated shampoos are meant to manage symptoms, not cure the condition. Following the product’s instructions and talking to a dermatologist is key.

Clarifying Misconceptions About Product Rotation

Some think switching between shampoos helps with seborrheic dermatitis. But, product rotation isn’t for everyone. Understanding your scalp’s needs and responding to changes is more important. If your current shampoo isn’t working, talk to a dermatologist before trying something new.

Lifestyle Factors That Influence Seborrheic Dermatitis Severity

Managing seborrheic dermatitis is more than just washing your hair. Lifestyle choices greatly affect how severe your symptoms are.

Stress Management Techniques for Symptom Reduction

Stress can make seborrheic dermatitis worse. Using stress-reducing activities daily can help. Activities like meditation, yoga, and deep breathing can lower stress.

• Meditation: Regular meditation practice can help calm the mind and reduce stress.
• Yoga: Combining physical postures, breathing techniques, and meditation, yoga can be an effective stress reducer.
• Deep Breathing Exercises: Simple yet effective, deep breathing can help manage stress.

Dietary Considerations and Possible Triggers

Your diet can greatly affect your seborrheic dermatitis symptoms. Some foods can make symptoms worse, while others can help.

Knowing what you eat and how it affects your condition is key. Foods high in sugar, dairy, and processed ingredients can make symptoms worse.

Dietary Component	Potential Impact on Seborrheic Dermatitis
High Sugar Intake	May worsen symptoms due to increased inflammation
Dairy Products	Can trigger or exacerbate symptoms in some individuals
Processed Foods	Often contain ingredients that can irritate the skin and worsen symptoms
Omega-3 Rich Foods	May help reduce inflammation and alleviate symptoms

Environmental Factors and Seasonal Adjustments

Things like humidity and temperature can change how your seborrheic dermatitis symptoms feel. Knowing this can help you adjust your care plan.

Dry air can make symptoms worse, while humid air might mean you need to wash more often. Paying attention to these changes can help you manage your symptoms better.

By taking these lifestyle factors into account and making the right changes, people with seborrheic dermatitis can manage their symptoms better. This can greatly improve their quality of life.

When to Consult a Dermatologist About Your Seborrheic Dermatitis

Knowing when to seek professional help is key for those with seborrheic dermatitis. Self-care and over-the-counter treatments can help a lot. But, there are times when a dermatologist’s expertise is needed to manage the condition well.

Signs Your Current Washing Approach Isn’t Working

If your hair washing routine isn’t helping, it’s time to see a dermatologist. Look out for these signs:

• Increased redness or inflammation
• Persistent itching or burning sensations
• Flaking or scaling that doesn’t improve with over-the-counter treatments
• Hair loss or thinning due to seborrheic dermatitis

Symptoms That Require Immediate Medical Attention

Some symptoms need immediate medical help. Seek a dermatologist if you notice:

• Severe itching or pain that interferes with daily activities
• Significant hair loss or bald patches
• Oozing or crusting on the scalp
• Signs of infection, such as increased redness, swelling, or pus

What to Expect During a Dermatology Consultation

At your consultation, the dermatologist will examine your scalp and review your medical history. Here’s what you can expect:

• A detailed assessment of your symptoms and their impact on your daily life
• A physical examination of your scalp to assess the severity of seborrheic dermatitis
• Discussion of your current hair care routine and any treatments you’ve tried
• Recommendations for medicated shampoos or other treatments tailored to your specific needs

By talking to a dermatologist, you can understand your seborrheic dermatitis better. You’ll get a plan to manage your symptoms and improve your life.

Conclusion: Finding Your Optimal Hair Washing Balance

Finding the right balance in hair washing is key to managing seborrheic dermatitis. Washing too much can remove natural oils. Not washing enough can cause oil and dead skin buildup, making symptoms worse.

Most people should wash their hair two to three times a week. But, this can change based on hair type and how severe the condition is. Using a medicated shampoo like Nizoral with Ketoconazole can help manage symptoms.

Getting the right hair washing balance is essential for managing seborrheic dermatitis. Knowing your scalp type, picking the right shampoo, and finding a good washing routine can help control symptoms. This improves your scalp health.

FAQ

References

• PubMed. Seborrheic Dermatitis: Exploring the Complex Interplay with Malassezia. https://pubmed.ncbi.nlm.nih.gov/39922985/
• PMC. [Title not available] (PMC8138261). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8138261/
• Nizoral UK. How Often Should You Wash Your Hair? https://www.nizoralshampoo.co.uk/blog/posts/2021/august/how-often-should-you-wash-your-hair
• American Academy of Dermatology. Seborrheic Dermatitis: Overview. https://www.aad.org/public/diseases/a-z/seborrheic-dermatitis-overview
• DermNet NZ. Seborrhoeic dermatitis. https://dermnetnz.org/topics/seborrhoeic-dermatitis