Written by the DermaVue Dermatology Team. Medically reviewed by Dr. Sarath Chandran, MD DVL, IADVL member, Managing Director, DermaVue.
Quick answer: If dandruff returns every time you stop your anti-dandruff shampoo, you are most likely dealing with seborrhoeic dermatitis, not a dry scalp. It is caused by an inflammatory reaction to Malassezia, a yeast that lives on everyone’s scalp. It cannot be cured permanently, but the right treatment and a simple maintenance routine keep it well controlled.
A common story at our clinics goes like this. The patient has tried three or four anti-dandruff shampoos over the past year. Each one worked for a few weeks. Then the flakes and the itching came back. Some have also tried oiling every night, switching to cold water, or cutting out certain foods.
This pattern usually points to seborrhoeic dermatitis. It is one of the most common scalp problems we see in Kerala and Tamil Nadu, and it responds well to treatment once it is correctly identified.
Dandruff or seborrhoeic dermatitis?
They are two ends of the same condition.
| Simple dandruff | Seborrhoeic dermatitis | |
|---|---|---|
| Flakes | Fine, dry, white or grey | Larger, greasy, yellowish |
| Scalp redness | None or very little | Often present (looks dusky brown on Indian skin) |
| Itching | Mild | Moderate to severe |
| Spread | Scalp only | Can reach eyebrows, sides of the nose, behind the ears, chest |
| Treatment | Medicated shampoo, used correctly | Usually needs prescription treatment plus maintenance |
Both are linked to Malassezia yeast. Unlike the ringworm-type infections we covered in our myths and facts about fungal infections post, this yeast lives on everyone’s skin. In seborrhoeic dermatitis, the skin’s immune system overreacts to it, so there is inflammation as well as flaking (DermNet: seborrhoeic dermatitis). That is why an antifungal shampoo alone sometimes gives only partial relief.
What makes it worse
Malassezia is part of normal skin. Everyone has it. Whether it causes trouble depends on the scalp’s oil level, the climate and your own immune response. The StatPearls clinical review on seborrhoeic dermatitis describes the same mix of yeast, sebum and immune factors.
| Trigger | Why it matters |
|---|---|
| Oily scalp | The yeast feeds on scalp oil (sebum). |
| Heat and humidity | More sweat and oil, and a warm, damp scalp the yeast prefers. |
| Stress and poor sleep | Flares often follow exams, work deadlines or a bad month. |
| Hormonal changes | Oil production rises in the teens and early adult years. |
| Some medical conditions | Much more common in Parkinson’s disease, HIV and other conditions that affect immunity or the nervous system. |
| Heavy hair products | Oils, gels and creams left on the scalp can trap sebum and irritate the skin. |
Dandruff is not caused by poor hygiene. Washing your hair every day will not prevent it, and harsh shampoos used too often can irritate the scalp further.
Why your anti-dandruff shampoo stopped working
It is being rinsed off too quickly
Medicated shampoos contain ingredients such as ketoconazole, zinc pyrithione, selenium sulfide or ciclopirox. These need three to five minutes of contact with the scalp. Most people lather and rinse straight away, as they would with a normal shampoo, so the medicine barely gets a chance to work.
The inflammation is not being treated
When redness and itching are the main problem, an antifungal shampoo handles only half the condition. A dermatologist may add a short course of an anti-inflammatory lotion to settle the scalp.
Treatment stops when the scalp looks clear
This is the most common reason dandruff comes back. The yeast is still there. Once the shampoo stops, it overgrows again within weeks.
It may not be dandruff at all
Several scalp conditions cause flaking and do not respond to anti-dandruff shampoo. See the next section.
Conditions that look like dandruff
| Condition | What is different | How it is confirmed |
|---|---|---|
| Scalp psoriasis | Thicker, drier, silvery scale in well-defined patches. Often crosses the hairline onto the forehead or neck. | Clinical exam, dermoscopy, biopsy if unclear |
| Contact dermatitis | Starts after a new shampoo, oil or hair dye. Can also affect the ears, neck and forehead. | History, patch testing |
| Scalp eczema | Very itchy, dry scale. Often a personal or family history of eczema, asthma or allergy. | Clinical exam and history |
| Tinea capitis (scalp ringworm) | More common in children. Scaly patches with broken hair or hair loss. | KOH test on a scalp scraping |
| Lichen planopilaris | Inflammation around hair follicles that can cause permanent hair loss if missed. | Dermoscopy, biopsy |
Using dandruff treatment on any of these wastes months. If you suspect psoriasis, read our guides on psoriasis treatment in Kerala and how to tell eczema from psoriasis. Lichen planopilaris is a scalp form of lichen planus, and a delay in diagnosis can mean permanent hair loss.
How a dermatologist treats it
Step 1: Settle the flare
-
A prescription-strength antifungal shampoo, such as ketoconazole 2%, used with the right contact time
-
A short course of a mild anti-inflammatory scalp lotion if redness and itching are significant
-
Non-steroid creams for the face, eyebrows and around the nose, where steroids should not be used for long
-
Oral antifungal tablets for a short period in severe or widespread cases
Step 2: Keep it under control
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Medicated shampoo once or twice a week, even when the scalp looks normal
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Alternating between two shampoos with different active ingredients
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Stepping up the routine before your usual flare season
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Reviewing hair oils and products that may be making it worse
Seborrhoeic dermatitis is a long-term condition. The aim is fewer and milder flares, not a one-time cure.
The seasonal pattern in Kerala and Tamil Nadu
| Season | What usually happens |
|---|---|
| Monsoon (June to September) | Humidity and sweat drive yeast growth. This is the worst season for most patients. |
| Summer (March to May) | Heat raises oil production. Flares are common in coastal Kerala. |
| Winter (November to January) | Drier air makes flaking more visible, even if the inflammation is milder. |
If you know your scalp flares every monsoon, increase your maintenance shampoo two to three weeks before the rains rather than waiting for the flakes to return. Our Kerala dermatology climate guide covers how each season affects skin and scalp.
When to see a dermatologist
-
No improvement after four weeks of using a medicated shampoo correctly
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Red, sore or very itchy scalp
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Flaking on the eyebrows, nose, ears or chest
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Hair fall along with the dandruff
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Dandruff returning within weeks every time you stop treatment
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You are not sure whether it is dandruff, psoriasis or something else
Frequently asked questions
What is the difference between dandruff and seborrhoeic dermatitis?
Dandruff is mild flaking with little or no inflammation. Seborrhoeic dermatitis is a more active form of the same condition, with greasy yellowish flakes, redness and itching, and it can spread to the face and chest. Both are linked to Malassezia yeast.
Why does my dandruff keep coming back?
The yeast behind it is a normal part of your skin and cannot be removed for good. Treatment controls it, and once treatment stops it grows back. A weekly maintenance routine prevents most relapses.
Why has my anti-dandruff shampoo stopped working?
Usually because it is rinsed off before it has time to act, because the inflammation needs separate treatment, or because the problem is not dandruff at all. Psoriasis and contact dermatitis are common lookalikes.
Is dandruff caused by not washing hair enough?
No. Dandruff is not a hygiene problem. It depends on scalp oil, climate, stress and your immune response. Washing more often does not prevent it.
Can dandruff cause hair fall?
Scalp inflammation and constant scratching can increase hair shedding. This usually settles once the scalp is treated. If hair fall is heavy, a dermatologist will check for other causes such as pattern hair loss or telogen effluvium.
Related: What causes hair fall in men and women
Is dandruff contagious?
No. You cannot catch dandruff or seborrhoeic dermatitis from another person, or from sharing a comb or pillow.
Where can I see a dermatologist for dandruff in Kerala and Tamil Nadu?
DermaVue has clinics in Thiruvananthapuram, Kollam, Thiruvalla, Kottayam, Kochi (Aluva), Thrissur and Coimbatore. Walk in, call, or WhatsApp the nearest branch to book a scalp assessment.
Book a scalp consultation at DermaVue
Our IADVL-registered dermatologists assess dandruff, seborrhoeic dermatitis, scalp psoriasis and other scalp conditions at all seven clinics. Dermoscopy is available at every branch. Find your nearest DermaVue clinic.
| Branch | Address | Phone / WhatsApp |
|---|---|---|
| Thiruvananthapuram | Poojappura Main Rd, Kesari Nagar, Chengalloor | +91 83308 60007 |
| Kollam | UMK Arcade, Vellayittambalam, Kavanad | +91 80868 60465 |
| Thiruvalla | Iykara Peniel Tower, opp. Indian Overseas Bank, Thukalassery | +91 80860 00608 |
| Kottayam | Zion Towers, Second Floor, SH 1, Thellakom | +91 81298 83331 |
| Kochi (Aluva) | Metro Pillar No. 57, near Pulinchodu, NH-47, Aluva | +91 90720 07733 |
| Thrissur | Ardra Arcade, opp. Akshaya Hotel, Punkunnam | +91 73567 42225 |
| Coimbatore | 460, Ponnaiyan St, Cross Cut Rd, Ram Nagar, Gandhipuram | +91 80868 60018 |
Related reading
Sources
Written by the DermaVue Dermatology Team. Medically reviewed by Dr. Sarath Chandran, MD DVL, IADVL member, Managing Director, DermaVue. Published November 2026. This article is for general information and does not replace a clinical consultation.
