FAST ANSWER
Seborrheic dermatitis is caused by a combination of yeast overgrowth on the skin, excess oil production, and a weakened skin barrier. Common triggers such as stress, weather changes, and harsh products can worsen symptoms and lead to flare-ups.
Seborrheic dermatitis can feel unpredictable.
Symptoms often come and go, and many people are unsure what is actually causing it.
The truth is, it is not caused by just one factor.
Instead, it develops due to a combination of internal and external influences that affect how your skin behaves.
If you understand these causes and triggers, you can take better control of your symptoms and reduce flare-ups over time.
If you would like a full overview of the condition, see our complete seborrheic dermatitis guide.
What Causes Seborrheic Dermatitis?
Seborrheic dermatitis is usually linked to three main factors:
• Yeast overgrowth on the skin
• Excess oil (sebum) production
• A weakened skin barrier
These factors work together to create irritation and inflammation.
1. Yeast Overgrowth (Malassezia)
A type of yeast naturally lives on the skin.
In seborrheic dermatitis, this yeast can grow more than normal.
This leads to:
• Irritation
• Inflammation
• Flaking
The scalp and face are especially affected because they produce more oil.
Facial irritation can sometimes overlap with eczema-prone skin. For more guidance, see our guide to eczema on the face.
2. Excess Oil Production
Seborrheic dermatitis often appears in areas with more oil glands, such as:
• Scalp
• Face (around nose and eyebrows)
• Chest
Oil provides an environment where yeast can thrive, increasing the likelihood of symptoms.
3. A Weakened Skin Barrier
When the skin barrier is compromised:
• Moisture escapes
• Irritants penetrate more easily
• Skin becomes more reactive
This makes symptoms worse and harder to control.
What Are Seborrheic Dermatitis Triggers?
Triggers do not cause the condition, but they can make it worse.
Common triggers include:
Stress
Stress can increase inflammation in the body.
This often leads to flare-ups or worsening symptoms.
These cycles of worsening symptoms are explained in more detail in Seborrheic Dermatitis Flare-Ups.
Weather Changes
Cold, dry weather can strip moisture from the skin.
Hot weather and sweating can also irritate the skin.
Harsh Skincare or Hair Products
Products that contain:
• Fragrance
• Alcohol
• Strong cleansing agents
can damage the skin barrier and worsen symptoms.
Hormonal Changes
Hormones can affect oil production.
This is why seborrheic dermatitis can flare at certain times.
Product Build-Up
Residue from shampoos or styling products can irritate the scalp.
Nicola's Experience With Persistent Scalp Irritation
Nicola spent years struggling with an itchy, irritated scalp that seemed to flare up repeatedly. Like many people, she initially assumed she was dealing with ordinary dandruff. However, despite trying various shampoos and scalp treatments, the itching, discomfort and visible flakes continued to return.
Nicola talks about her experience with Bragan Skincare
The condition became so frustrating that she often found flakes on her clothing and work uniform, leaving her feeling self-conscious throughout the day. Over time, Nicola realised there was likely more contributing to her symptoms than simple dryness alone.
Learning more about scalp irritation, skin barrier health and common triggers helped her better understand what might be affecting her scalp. While every person's scalp is different and no product works for everyone, stories like Nicola's remind us how common it is for people to spend years searching for answers to ongoing scalp discomfort.
You can watch Nicola's full review here.
Causes vs Triggers: What’s the Difference?
Understanding this helps you manage the condition more effectively.
• Causes = underlying reasons your skin is prone to the condition
• Triggers = factors that make symptoms worse
For example:
• Yeast overgrowth = cause
• Stress = trigger
Many skin conditions share similar underlying causes. To understand this more broadly, see what causes eczema and why it happens.
Why the Scalp Is Commonly Affected
The scalp produces more oil than most areas of the body, creating the perfect environment for yeast growth. Since flaking in this area is frequent, it is important to distinguish between minor issues and chronic ones by understanding the dandruff vs seborrheic dermatitis difference.
To understand this area in more detail, see seborrheic dermatitis on the scalp.
How Causes Affect Treatment
Understanding the cause helps guide treatment.
Effective treatment focuses on:
• Controlling yeast
• Reducing inflammation
• Supporting the skin barrier
To learn how to manage symptoms, see seborrheic dermatitis treatment and long-term care.
Real People. Real Reviews. Real Results.
The reviews, photographs and video testimonials featured throughout our website come from genuine Bragan Skincare customers who have chosen to share their experiences.
Over the years, we have worked with hundreds of people dealing with eczema, psoriasis, dermatitis, sensitive skin and scalp irritation. Many have kindly allowed us to share their stories, photographs and videos to help others understand that they are not alone in their skin journey.
Unlike many skincare brands, the vast majority of the videos featured on our website were not filmed in professional studios or created by marketing agencies. Most were recorded by customers themselves using their own mobile phones at home, in their kitchens, living rooms, workplaces, or wherever they felt comfortable sharing their story.
We are proud of that. While these videos may not always have perfect lighting, professional editing or polished production, they represent something far more important to us: real people sharing genuine experiences in their own words.
While no skincare product works for every person, the vast majority of our customers report positive results. Because every skin type is unique, we always recommend carrying out a patch test before introducing any new skincare product into your routine.
Our goal has always been to provide honest information, realistic expectations and gentle skincare designed to support sensitive skin over the long term.
Supporting Your Skin Barrier
Even though yeast plays a role, the skin still needs support.
A gentle option like our Atopic Cream can help:
• Soothe irritation
• Hydrate sensitive skin
• Support barrier repair
Itching is also a common symptom in eczema. Learn more about eczema itching and how to stop it.
Reducing Triggers in Daily Life
Simple changes can make a big difference.
Focus on:
• Using gentle, fragrance-free products
• Managing stress where possible
• Keeping a consistent routine
• Avoiding harsh treatments
Once you understand the causes, choosing the right product becomes easier see Best Shampoo for Seborrheic Dermatitis.
When To Seek Medical Advice
Although seborrheic dermatitis is common, persistent or worsening symptoms should not be ignored.
It may be helpful to seek professional medical advice if:
• Symptoms remain severe despite treatment
• Redness becomes more intense or widespread
• The skin becomes painful, cracked, or begins to bleed
• Signs of infection develop
• Symptoms spread beyond the scalp to areas such as the face, ears, eyebrows, or chest
• You are unsure whether you are dealing with seborrheic dermatitis, psoriasis, eczema, or another skin condition
A healthcare professional can help identify the underlying cause of ongoing symptoms and recommend the most appropriate treatment approach.
Final Thoughts
Seborrheic dermatitis is caused by a combination of yeast activity, oil production, skin barrier dysfunction, and environmental triggers. While there is no single cause, understanding what drives symptoms can make flare-ups easier to manage and long-term control more achievable.
While you cannot remove the causes completely, you can:
• Reduce triggers
• Support your skin
• Build a consistent routine
Over time, this leads to better control and fewer flare-ups.
FAQs About Seborrheic Dermatitis Causes & Triggers
What causes seborrheic dermatitis?
Seborrheic dermatitis is caused by a combination of yeast overgrowth on the skin (Malassezia), excess oil production, and a weakened skin barrier that makes the skin more sensitive and reactive.
Is seborrheic dermatitis caused by poor hygiene?
No. It is not caused by poor hygiene. In fact, both under-washing and over-washing can make symptoms worse by disrupting the skin barrier and affecting the natural balance of the scalp and skin.
What are the most common triggers of seborrheic dermatitis?
Common triggers include stress, cold or dry weather, sweating, hormonal changes, and harsh skincare or hair products that contain fragrance, alcohol, or strong cleansing agents.
Why does seborrheic dermatitis keep coming back?
It is a chronic, recurring condition influenced by internal factors like oil production and yeast levels, as well as external triggers. If triggers are not managed, flare-ups can return even after improvement.
Can lifestyle changes help reduce seborrheic dermatitis?
Yes. A consistent routine, gentle fragrance-free products, stress management, and avoiding harsh treatments can help reduce flare-ups and improve long-term control of symptoms.
Our Goal
At Bragan Skincare, our goal has never been unrealistic promises or aggressive
skincare routines. Our focus has always been on creating gentle products designed
to support sensitive skin and help people feel more comfortable and confident in
everyday life.
