Dandruff: What Causes It and How to Treat It
A calm scalp, a confident you.
White flakes on your shoulders, an itchy scalp, and the feeling that washing more often makes no difference. Dandruff is one of the most common scalp complaints, and one of the most misunderstood.
- What actually causes dandruff?
- Which shampoo ingredients work?
- How often should you wash?
- When is it more than dandruff?
Let's look at what dermatologists recommend.
1. What is dandruff?
Dandruff is a common scalp condition in which small flakes of skin shed from the scalp. It can be itchy, and flakes are more visible on dark hair and clothing.
According to the American Academy of Dermatology (AAD), it's a misconception that dandruff is caused by poor hygiene.
The takeaway: Dandruff is common, harmless and not a sign that you're unclean.
2. What causes it?
Dandruff can develop for several reasons:
- Oily skin and scalp.
- A yeast called Malassezia, which lives on everyone's scalp but can trigger irritation and flaking in some people.
- Hair care habits, such as not washing often enough for your scalp type.
- Dry skin, which tends to cause smaller, less oily flakes.
- Sensitivity to hair products.
- Medical conditions such as seborrheic dermatitis, psoriasis or eczema.
The takeaway: Oil, yeast and your routine are the usual culprits.
3. Which shampoo ingredients work?
The AAD recommends looking for a dandruff shampoo with one of these active ingredients:
| Ingredient | How it helps |
|---|---|
| Zinc pyrithione | Antifungal and antibacterial; good for daily or regular use |
| Ketoconazole | Antifungal; targets Malassezia |
| Selenium sulfide | Antifungal; slows skin cell shedding |
| Salicylic acid | Loosens and lifts scale |
| Sulfur | Helps remove flakes |
| Coal tar | Slows skin cell growth; can make the scalp more sensitive to sun |
If one shampoo doesn't work, the AAD suggests alternating between shampoos with different active ingredients. Explore Head & Shoulders and scalp care at Avnzor.
The takeaway: Choose by active ingredient, not by brand or scent.
4. How to use a dandruff shampoo
- Follow the label. Some shampoos need to stay on the scalp for 5 to 10 minutes before rinsing.
- Lather on the scalp, not just the hair.
- Match frequency to your hair type:
| Hair type | Suggested routine (AAD) |
|---|---|
| Fine, straight or oily | Shampoo often, possibly daily, with dandruff shampoo about twice a week |
| Coarse, curly or coily | Wash when needed, with dandruff shampoo about once a week; apply it to the scalp only |
You can follow with your usual conditioner. For more on picking shampoo for your hair, read our shampoo selection guide.
The takeaway: Contact time and frequency matter as much as the ingredient.
5. Common myths
- "Dandruff means you're not washing enough." Not always; it's about oil, yeast and your skin.
- "Oiling the scalp cures dandruff." Heavy oils can feed Malassezia and make flakes worse for some people.
- "Dandruff is contagious." It isn't.
- "Dandruff causes permanent hair loss." Scratching can damage hair, but dandruff itself doesn't cause permanent loss. If you're worried about shedding, see our hair health guide.
The takeaway: Treat the scalp, not just the flakes.
6. Dandruff or something else?
See a dermatologist if:
- Flakes don't improve after a few weeks of using a dandruff shampoo.
- Your scalp is very red, swollen, painful or oozing.
- You see thick, silvery scales (possible psoriasis).
- The rash spreads to your face, ears or eyebrows.
- You have patches of hair loss.
A dermatologist may prescribe a stronger shampoo or medication, and can check for seborrheic dermatitis, psoriasis or fungal infection.
The takeaway: Persistent or severe flaking deserves a proper diagnosis.
7. Dandruff in Saudi Arabia: why this matters
Heat and sweat can make the scalp oilier, while covering the hair for long hours can trap heat and moisture. Air-conditioned spaces can also dry the scalp.
Washing the scalp regularly, letting hair dry fully before covering it, and using a dandruff shampoo consistently can help. The AAD also notes that a sunburnt scalp can increase flaking, so protect your scalp outdoors.
The takeaway: Climate and hair covering habits both play a role.
8. How to choose a dandruff shampoo: six questions
- Does it contain an active ingredient recommended by dermatologists?
- Is my scalp oily or dry?
- Is my hair fine, curly or coily?
- Can I leave it on for the time the label recommends?
- Have I tried it consistently for a few weeks before switching?
- Is it registered with the SFDA?
The takeaway: The right shampoo is the one with the right active, used the right way.
Frequently asked questions
How long does dandruff shampoo take to work?
Many people see improvement within a few weeks of regular use.
Can I use dandruff shampoo every day?
Some, such as zinc pyrithione, can be used often. Follow the label.
Do I need to keep using it once flakes clear?
Dandruff often comes back, so many people continue once or twice a week.
Is dandruff worse in winter?
It can be. Dry indoor air and less sun can make flaking worse.
Can children use dandruff shampoo?
Check the label, and ask a pharmacist or doctor for young children.
The Avnzor takeaway
Dandruff is common and treatable. Choose a shampoo with a proven active ingredient, give it time on your scalp, match your routine to your hair type, and see a dermatologist if it doesn't improve.
At Avnzor, we believe a healthy scalp is the start of healthy hair.
A calm scalp, a confident you.
Explore shampoos and scalp care from Avnzor.
Sources
Disclaimer: This article is for general education and is not a substitute for advice from a doctor, dentist or pharmacist. Consult a healthcare professional before starting any supplement or treatment, especially if you are pregnant or breastfeeding, have a medical condition or take regular medication. Doses and treatments for babies and children are set by a doctor.
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