Quick answer. Seborrhoeic dermatitis and dandruff are part of the same spectrum, driven by an overgrowth of Malassezia yeast that naturally lives on the skin, combined with oily skin and an inflammatory response. In Singapore’s hot, humid climate, sweating and oil can make flare-ups worse. Dandruff causes itchy, flaky scalp; seborrhoeic dermatitis adds redness and greasy yellowish scales on the scalp, eyebrows, sides of the nose, ears and chest. It is chronic and relapsing rather than curable, but very controllable. Treatment uses antifungal medicated shampoos (ketoconazole, selenium sulfide, zinc pyrithione, ciclopirox), used regularly, plus mild topical anti-inflammatories for facial areas. See a doctor if it is severe, spreading or not improving.
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Dandruff and seborrhoeic dermatitis are extremely common and closely related. Mild flaking and itching of the scalp is dandruff; when there is also redness and greasy, yellowish scaling — on the scalp, eyebrows, around the nose, in the ears or on the chest — it is called seborrhoeic dermatitis. Both sit on the same spectrum and respond to similar treatments.
In Singapore’s warm, humid weather, sweat and oil can trigger or worsen flare-ups, and many people find the problem comes and goes for years. This guide explains why it happens, how to control it with the right shampoos and creams, and when it is worth seeing a doctor.
At a glance
| Active ingredient | Main action | Typical use |
|---|---|---|
| Ketoconazole (e.g. 2%) | Antifungal – reduces Malassezia yeast | Shampoo 2–3 times a week; also as cream for face/skin |
| Selenium sulfide | Antifungal and reduces scaling | Anti-dandruff shampoo, used a few times weekly |
| Zinc pyrithione | Antifungal / antimicrobial | Common in over-the-counter anti-dandruff shampoos |
| Ciclopirox | Antifungal | Shampoo or cream alternative |
| Coal tar / salicylic acid | Reduce scaling and itch | Helpful for thicker scale; salicylic acid loosens scale |
| Mild topical steroid / calcineurin inhibitor | Reduce redness and inflammation | Short courses for inflamed facial or scalp areas, doctor-guided |
What causes seborrhoeic dermatitis and dandruff?
The key player is Malassezia, a yeast that naturally lives on everyone’s skin. In susceptible people, it overgrows in oily (sebum-rich) areas and triggers an inflammatory and flaking response. The result is dandruff at the milder end and seborrhoeic dermatitis when there is visible redness and greasy scaling.
Contributing factors include:
- Oily skin and active sebaceous (oil) glands.
- Hot, humid weather and sweating — relevant year-round in Singapore.
- Stress, fatigue and infrequent washing.
- Certain conditions (for example a weakened immune system or Parkinson’s disease) can make it more severe.
It is not caused by poor personal hygiene, and it is not contagious.
Why Singapore's climate matters
Singapore is hot and humid all year. Heat and humidity increase sweating and oil production on the scalp and face, which can feed Malassezia overgrowth and trigger flare-ups. Frequent outdoor activity, occlusive headgear and helmets, and prolonged sweating can all aggravate the scalp.
Practical measures that help in this climate include washing hair regularly, rinsing off sweat after exercise, keeping the scalp and face from staying greasy for long periods, and not overusing heavy oils or pomades that trap sebum.
Treating the scalp: medicated shampoos
The cornerstone of scalp treatment is regular use of antifungal or anti-dandruff medicated shampoo, typically two to three times a week, then less often for maintenance. Effective active ingredients include:
- Ketoconazole (e.g. 2%) — a widely used antifungal that targets Malassezia; available in Singapore in pharmacies.
- Selenium sulfide and zinc pyrithione — reduce yeast and scaling.
- Ciclopirox — another antifungal option.
- Coal tar or salicylic acid — help with thicker scale and itch.
For best results, leave the shampoo on the scalp for a few minutes before rinsing, and rotate or alternate products if one stops working. Because the condition relapses, ongoing intermittent use is usually needed even after it clears.
Facial and body seborrhoeic dermatitis
Seborrhoeic dermatitis often affects the face — the sides of the nose, eyebrows, between the brows, the ears, and sometimes the chest and skin folds — with redness and fine greasy scale.
For these areas, treatment includes:
- Antifungal creams (such as ketoconazole cream) applied to affected skin.
- Short courses of a mild topical steroid or a calcineurin inhibitor (such as tacrolimus or pimecrolimus) to settle redness, used under guidance to avoid overuse on the face.
- Gentle, non-greasy skincare and avoiding harsh scrubbing.
Because facial skin is delicate, it is worth getting a doctor’s advice rather than using strong steroids long-term on the face.
A chronic, relapsing condition
It is important to understand that seborrhoeic dermatitis and dandruff are usually chronic and relapsing. Treatment controls flare-ups very effectively but does not permanently cure the tendency, so symptoms often return when treatment stops or during periods of stress, heat or illness.
Thinking of it as a condition to manage rather than to cure once-and-for-all sets realistic expectations. Many people do well with intermittent maintenance shampooing and quick treatment of flares, keeping it largely invisible to others.
When to see a doctor
Self-care with medicated shampoos is enough for most people, but see a doctor if:
- It does not improve after a few weeks of appropriate over-the-counter treatment.
- The scalp or face is very red, sore, weeping or crusted, or there are signs of infection.
- It is widespread or severe, or significantly affecting your comfort or confidence.
- You are unsure of the diagnosis, as other conditions such as psoriasis or fungal infection can look similar.
- A baby has stubborn cradle cap, or symptoms appear alongside another illness.
A dermatologist can confirm the diagnosis and prescribe stronger or combination treatments where needed.
Related guides
- Best Dermatology Clinics in Singapore — our editorial shortlist
- dermatology clinics directory
- Skin cancer & melanoma
- Vitiligo treatment
- Alopecia areata
Sources
- National Skin Centre – Skin Diseases of the Scalp
- DermNet – Seborrhoeic dermatitis
- British Association of Dermatologists – Seborrhoeic dermatitis (PIL)
- Ketoconazole Shampoo for Seborrheic Dermatitis: A Narrative Review (PMC)
Related conditions & guides
Related conditions and guides you may find useful:
- Eczema (Atopic Dermatitis) Treatment in Singapore
- Hives (Urticaria) in Singapore
- Psoriasis in Singapore
- Rosacea in Singapore
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