Seborrhoeic dermatitis
Informed by recognized medical guidance
Overview
Seborrhoeic dermatitis is a common, long-term skin condition that causes red, scaly, greasy patches, often on the scalp, face, chest, and other oily areas. It is not contagious and can usually be managed with treatment.
Key facts
- It is very common, affecting about 5 out of every 100 people.
- It is not caused by poor hygiene and cannot be spread to others.
- It often comes and goes, with flare-ups triggered by things like stress or cold weather.
Yes, seborrhoeic dermatitis is a very common skin condition worldwide.
It can affect anyone, but it is most common in infants (as cradle cap) and in adults between the ages of 30 and 60. Men are affected slightly more often than women.
Symptoms
- You have signs of a severe allergic reaction, such as trouble breathing, swelling of the face or mouth, or widespread hives
- ⚠The affected skin becomes hot, swollen, or oozes pus – this could be a bacterial infection
- ⚠You have a fever along with a spreading red rash
Common symptoms
- White or yellowish greasy scales (dandruff) on the scalp
- Red, inflamed skin on the scalp, face (especially around the nose, eyebrows, and ears), chest, or upper back
- Itching or burning sensation in affected areas
- Flaky skin that may look like patches of eczema
Symptoms in children
- Cradle cap – thick, yellow, greasy scales on a baby’s scalp
- Red, scaly skin in the diaper area or other skin folds
Symptoms in older adults
- More severe scaling and redness, often in skin creases (like behind the ears)
- Dry, cracked skin that may become infected if scratched
Causes
Main causes
- An overgrowth of a yeast called Malassezia that naturally lives on the skin
- An overactive immune response to that yeast
- Excess oil (sebum) production in the skin
Risk factors
- Stress or fatigue
- Cold, dry weather
- Oily skin or hair
- Certain medical conditions like Parkinson's disease, HIV, or psoriasis
- Family history of seborrhoeic dermatitis
When to see a doctor
See a doctor urgently if:
- Signs of skin infection: hot, swollen, painful skin that oozes pus
- Widespread rash with fever
Book a routine appointment if:
- You have tried over-the-counter dandruff shampoos and moisturisers for a few weeks without improvement
- The itching or flaking is severe enough to affect your daily life or sleep
- The rash spreads to many areas of your body
Diagnosis
A doctor or dermatologist can usually diagnose seborrhoeic dermatitis by looking at your skin and scalp and asking about your symptoms. In most cases, no tests are needed.
Tests that may be done
- Sometimes the doctor may gently scrape a small sample of skin scales to look at under a microscope – this helps rule out other conditions like fungal infections or psoriasis.
What to expect at your appointment
Your doctor will examine the affected areas and ask about your health, stress levels, and grooming habits. The appointment is usually quick and straightforward.
Treatment
Treatment aims to reduce inflammation, scale, and yeast overgrowth. A combination of lifestyle measures and medicated products often works well. Always follow your doctor’s advice – do not use prescription treatments without guidance.
Self-care at home
- Wash your scalp daily or every other day with a mild shampoo, then rinse thoroughly
- Gently remove scales with a soft brush or cloth after washing (do not scratch or pick)
- Use a gentle moisturiser on affected facial or body areas
- Manage stress with relaxation techniques or exercise
- Avoid harsh soaps, alcohol-based products, and very hot water
Medical treatments
Your doctor may recommend medicated shampoos, creams, or lotions that help control yeast growth and reduce inflammation. These include antifungal treatments and mild steroids for short-term use. They may also suggest a specific type of light therapy for stubborn cases. Always use treatments exactly as prescribed.
Living with this condition
Most people manage seborrhoeic dermatitis with a regular skin care routine. Cleanse gently, moisturise when needed, and use medicated products as directed. Flare-ups are normal, but with good care they usually settle down.
Lifestyle tips
- Keep a diary to identify your personal triggers (stress, weather, certain skin products)
- Avoid scratching or picking at scales, which can lead to infection
- Wear soft, breathable fabrics like cotton to reduce irritation
Diet and exercise
A balanced diet rich in fruits, vegetables, and whole grains may help your skin stay healthy. There is no strong evidence that changing your diet cures seborrhoeic dermatitis, but some people find that eating less sugar or more omega-3 fatty acids (from fish or flaxseed) helps. Regular exercise can also lower stress, a common trigger.
Mental health and emotional wellbeing
The visible flakes and redness can make some people feel self-conscious or embarrassed. This is completely understandable. Remember that seborrhoeic dermatitis is very common and treatable. If it affects your mood or confidence, talk to your doctor – they can help with treatment and may refer you to a counsellor.
Prevention
There is no sure way to prevent seborrhoeic dermatitis because it is linked to natural processes on your skin. However, you can reduce flare-ups by keeping your skin clean and moisturized, managing stress, and avoiding known triggers like harsh soaps or cold, dry air.
Complications
If left untreated
- Thick, stubborn scales that can be uncomfortable and harder to treat
- Skin infections caused by scratching (impetigo or cellulitis)
- Feelings of low self-esteem or anxiety about appearance
Long-term outlook
For most people, seborrhoeic dermatitis is a long-term condition that comes and goes, but it can be well controlled with the right care. Flare-ups are not dangerous and do not cause permanent skin damage. With treatment, the vast majority of people see major improvement and live comfortably.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
Sources and guidance
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 9, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.