Dandruff and Psoriasis
Dandruff and scalp psoriasis — symptoms, causes, diagnosis and UK treatments including Nizoral, Betacap, Dovobet and Etrivex. NICE-aligned.
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Dandruff & Scalp Psoriasis
Dandruff and scalp psoriasis — symptoms, causes, how to tell them apart, and UK treatment options.
Key fact: Dandruff and scalp psoriasis are both common scalp conditions but have different causes and require different treatments. Dandruff affects up to 50% of adults and is caused by yeast overgrowth. Scalp psoriasis is an autoimmune condition affecting around 60% of people with psoriasis. Getting the right diagnosis is essential — and effective prescription treatment is available online through Access Doctor.
What Is Dandruff?
Dandruff — also known as pityriasis capitis — is the most common scalp condition in the UK. It is characterised by the excessive shedding of dead scalp skin cells as white or grey flakes. The underlying cause is overgrowth of Malassezia globosa, a yeast-like fungus that is naturally present on the scalp. In susceptible individuals, it breaks down scalp sebum into fatty acids that irritate the skin, accelerating the skin renewal cycle and causing visible flaking.
Dandruff is not caused by poor hygiene and is not contagious. It ranges from mild, occasional flaking to persistent, severe flaking with an itchy scalp. Seborrhoeic dermatitis is a more inflammatory form of the same condition that can affect the scalp as well as the face (eyebrows, nasolabial folds), ears, and chest.
What Is Scalp Psoriasis?
Scalp psoriasis is a chronic autoimmune skin condition in which the immune system triggers an accelerated cycle of skin cell production. Normal skin cells renew every 28–30 days; in psoriasis, this cycle takes 3–7 days, causing cells to accumulate on the surface as thick scale. It is mediated by T-cell activation and the release of inflammatory cytokines, particularly interleukin-17 (IL-17) and interleukin-23 (IL-23).
Scalp psoriasis presents as well-defined, raised plaques with thick silvery-white scale on a salmon-pink base. Unlike dandruff, it often extends beyond the hairline onto the forehead, back of the neck and behind the ears. It is part of a systemic condition — many patients with scalp psoriasis also have psoriasis elsewhere on the body, and there is an association with psoriatic arthritis.
How to Tell Dandruff and Scalp Psoriasis Apart
| Feature | Dandruff | Scalp Psoriasis |
|---|---|---|
| Flake appearance | Fine, loose, white or grey flakes | Thick, adherent silvery-white scale |
| Scalp appearance | Diffuse scaling, no defined plaques | Well-defined raised plaques, salmon-pink base |
| Location | Confined to the scalp | Often extends beyond hairline onto forehead, neck, ears |
| Itch | Mild to moderate | Often intense; can disrupt sleep |
| Cause | Malassezia yeast overgrowth | Autoimmune (T-cell mediated) |
| Associated conditions | Seborrhoeic dermatitis | Body psoriasis, psoriatic arthritis |
| Response to antifungals | Yes — ketoconazole is effective | No — antifungals do not treat psoriasis |
| Response to corticosteroids | Adjunct only — short course for inflamed seborrhoeic dermatitis | Yes — key treatment component |
Diagnosis matters: Using the wrong treatment wastes time and can worsen symptoms. Ketoconazole shampoo is effective for dandruff but has no effect on scalp psoriasis. Topical corticosteroids are appropriate for scalp psoriasis but not typically required for ordinary dandruff. If you are unsure which condition you have, a short online consultation can help clarify.
Causes and Triggers
Dandruff triggers
Stress, hormonal changes, cold or dry weather, infrequent shampooing, certain hair products, and an oily scalp all promote Malassezia overgrowth and flaking.
Scalp psoriasis triggers
Stress, streptococcal throat infections, injury to the skin (Köbner phenomenon), certain medications (beta-blockers, lithium, antimalarials), smoking, alcohol and hormonal changes can all trigger or worsen scalp psoriasis.
Genetic factors
Scalp psoriasis has a strong genetic component. Around one-third of people with psoriasis have a first-degree relative with the condition. Dandruff also has a genetic predisposition, particularly for seborrhoeic dermatitis.
Immune factors
Scalp psoriasis is driven by immune dysregulation. People who are immunocompromised (including those with HIV) may experience more severe seborrhoeic dermatitis. The two conditions share some inflammatory pathways but are fundamentally different in mechanism.
Diagnosis
Both conditions are typically diagnosed clinically — based on the appearance of the scalp, the distribution of scaling, and associated symptoms. No laboratory tests are required to diagnose dandruff. For scalp psoriasis, a GP or dermatologist will assess:
- The presence and appearance of well-defined plaques
- Whether scaling extends beyond the hairline
- Involvement of other body sites (elbows, knees, nails, lower back)
- Family history of psoriasis
- Response to previous treatments
In some cases, particularly where the diagnosis is uncertain or treatment has failed, a dermatology referral is appropriate. A skin biopsy can confirm scalp psoriasis histologically where necessary.
Treatment Options
Treatment differs significantly between the two conditions. NICE and the British Association of Dermatologists (BAD) recommend a stepped approach based on severity.
Dandruff and Seborrhoeic Dermatitis
| Severity | Treatment | Product |
|---|---|---|
| Mild | OTC anti-dandruff shampoos (zinc pyrithione, selenium sulphide, coal tar) used regularly | OTC |
| Moderate | Ketoconazole 2% shampoo — antifungal; highly effective for Malassezia-related dandruff | Nizoral / ketoconazole (prescription) |
| Severe / seborrhoeic dermatitis | Ketoconazole shampoo + short course of mild topical corticosteroid for inflammation | Prescription required |
Scalp Psoriasis
| Severity | Treatment | Product |
|---|---|---|
| Mild | Emollients; coal tar + salicylic acid + sulphur preparations to soften scale | Cocois ointment (prescription) |
| Mild–moderate | Potent topical corticosteroid scalp application | Betnovate scalp application / Betacap (prescription) |
| Moderate–severe | Combination vitamin D analogue + corticosteroid gel; once-daily application | Dovobet gel (prescription) |
| Severe / resistant | Potent corticosteroid shampoo used short-term under prescriber supervision | Etrivex shampoo (prescription) |
NICE guidance: Topical corticosteroids should be used at the lowest effective potency for the shortest time necessary. Potent corticosteroids (Betnovate, Betacap, Dovobet) are appropriate for scalp psoriasis but should be reviewed regularly. Very potent corticosteroids (Etrivex) require prescriber oversight and should not be used long-term without clinical review.
Get Prescription Scalp Treatment Online
Access Doctor provides prescription treatments for dandruff and scalp psoriasis — including ketoconazole shampoo, Betacap, Betnovate, Dovobet gel and Etrivex — following a short online consultation with our GPhC-registered pharmacist independent prescribers.
View Scalp Treatments →When to Seek Help
See a clinician if:
- Over-the-counter anti-dandruff shampoos have not improved symptoms after 4–6 weeks
- You have thick scale that does not respond to standard treatments
- Scaling extends beyond the scalp onto the face, neck or ears
- Your scalp is significantly inflamed, cracked or bleeding
- You have joint pain alongside your scalp condition — this may indicate psoriatic arthritis
- The condition is significantly affecting your quality of life, sleep or confidence
Urgent attention: Widespread skin redness and scaling affecting the whole body (erythrodermic psoriasis) is a rare but serious complication requiring emergency assessment. If you develop rapidly spreading redness and scaling over most of your body, seek urgent medical attention or call 999.
Dandruff & Scalp Psoriasis Guides
In-depth guides on dandruff, scalp psoriasis and the prescription treatments available:
Frequently Asked Questions
What is the difference between dandruff and scalp psoriasis?
Dandruff produces loose, fine white or grey flakes and is caused by Malassezia yeast overgrowth. Scalp psoriasis causes thick, well-defined silvery-white scale on a salmon-pink base and is an autoimmune condition. Psoriasis plaques are sharply demarcated and often extend beyond the hairline. Dandruff flakes are diffuse and do not usually extend beyond the scalp. A GP or dermatologist can confirm the diagnosis.
Can dandruff turn into psoriasis?
No. Dandruff and scalp psoriasis are distinct conditions with different underlying causes. Dandruff is caused by fungal overgrowth; scalp psoriasis is an autoimmune condition. One does not progress into the other, though both can occur simultaneously.
What is the best treatment for scalp psoriasis?
NICE and the British Association of Dermatologists recommend a stepped approach. First-line treatments include coal tar preparations (Cocois ointment) and potent topical corticosteroids (Betnovate scalp application or Betacap). For moderate-to-severe scalp psoriasis, Dovobet gel (calcipotriol and betamethasone) is recommended. For severe or resistant scalp psoriasis, Etrivex shampoo (clobetasol propionate 0.05%) is used under prescriber supervision.
What is the best shampoo for dandruff?
Ketoconazole 2% shampoo (Nizoral) is the most clinically effective treatment for moderate-to-severe dandruff and seborrhoeic dermatitis. It works by reducing Malassezia yeast overgrowth. For mild dandruff, over-the-counter shampoos containing zinc pyrithione or selenium sulphide are effective first options.
Is scalp psoriasis contagious?
No. Scalp psoriasis is an autoimmune condition — it cannot be caught or passed on to others. Dandruff is also not contagious despite being associated with a naturally occurring yeast.
What triggers scalp psoriasis?
Common triggers include stress, streptococcal throat infections, certain medications (beta-blockers, lithium, antimalarials), injury to the skin (Köbner phenomenon), smoking, alcohol and hormonal changes. Avoiding known personal triggers can help reduce flare frequency.
Can I get dandruff or scalp psoriasis treatment online in the UK?
Yes. Access Doctor provides prescription treatments for dandruff and scalp psoriasis following a short consultation with our GPhC-registered pharmacist independent prescribers. No GP appointment is required.
Prescription Scalp Treatments — Online Consultation
Access Doctor stocks a full range of prescription scalp treatments. Complete a short online consultation reviewed by our GPhC-registered pharmacist independent prescribers — delivered to your door across the UK.
View All Scalp Treatments →References
- National Institute for Health and Care Excellence (NICE). Psoriasis: Clinical Knowledge Summary. Updated 2023. cks.nice.org.uk/topics/psoriasis
- National Institute for Health and Care Excellence (NICE). Seborrhoeic dermatitis: Clinical Knowledge Summary. Updated 2023. cks.nice.org.uk/topics/seborrhoeic-dermatitis
- British Association of Dermatologists. Guideline for the Management of Psoriasis. BAD, 2024. www.bad.org.uk/guidelines
- NHS. Psoriasis. NHS.uk, 2023. nhs.uk/conditions/psoriasis
- NHS. Dandruff. NHS.uk, 2023. nhs.uk/conditions/dandruff
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.
