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Health condition · Clinically reviewed

Dandruff and itchy scalp, from mild flakes to persistent itch worth investigating.

A persistently itchy scalp is not always dandruff. Seborrhoeic dermatitis, psoriasis, tinea and contact allergy all look similar and each needs its own plan.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE, BAD and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK guidance on seborrhoeic dermatitis, scalp psoriasis, tinea capitis and refractory scalp itch.

Key facts

Dandruff and itchy scalp at a glance.

The essentials in plain English - what it is, the common causes and how it is treated in the UK today.

  • What it is

    An itchy, flaking or inflamed scalp with many possible causes, from seborrhoeic dermatitis to psoriasis, tinea and contact allergy.

  • Common driver

    Seborrhoeic dermatitis linked to Malassezia yeast, greasy yellow scale and background erythema.

  • Mild end

    Simple dandruff sits at the mild end of the spectrum with white flakes and minimal inflammation. See our dedicated dandruff guide.

  • Look-alikes

    Scalp psoriasis, tinea capitis, contact allergy to hair dye or shampoo and head lice can all present as an itchy scalp.

  • First-line therapy

    Medicated shampoos with ketoconazole, selenium sulfide, zinc pyrithione or coal tar, rotated two to three times a week.

  • When to refer

    Scarring alopecia, atypical patterns, suspected tinea in children or refractory itch warrant specialist dermatology review.

Why this guide matters

One symptom, several causes, different treatments.

Getting the diagnosis right is the difference between endless shampoo swaps and a scalp that actually settles. The three points below shape the rest of this page.

  • Look for the pattern

    Location, scale colour and hair-line involvement usually point to one of a handful of causes - seborrhoeic dermatitis, psoriasis, tinea or contact allergy.

  • Rotate medicated shampoos

    Ketoconazole, selenium sulfide, zinc pyrithione and coal tar all work. Rotating actives works better than sticking to one.

  • Escalate refractory scalps

    Steroid lotions, calcineurin inhibitors, vitamin D analogues, oral antifungals or biologics all have a role. Refer if standard care fails.

How the diagnosis is made

From first itch to a clear plan.

The steps a UK GP or dermatologist will normally follow so you know what to expect and why.

  1. 01

    Assessing

    Focused history

    Onset, duration, hair products, dye exposure, family history and any prior treatments that helped or worsened it.

  2. 02

    Assessing

    Scalp examination

    Inspect at the parting, hair-line, eyebrows, nasolabial folds and behind the ears. Look at nails and skin elsewhere.

  3. 03

    Assessing

    Assess the pattern

    Greasy yellow scale points to seborrhoeic dermatitis. Thick silvery well-demarcated plaques suggest psoriasis. Patchy hair loss and broken hairs raise tinea capitis.

  4. 04

    Confirming

    Scalp brushings and mycology

    Hair samples sent for fungal culture where tinea capitis is possible, especially in children with patchy alopecia.

  5. 05

    Confirming

    Patch testing

    Where contact allergy to hair dye (PPD) or preservatives (MI/MCI) is suspected, patch testing identifies the culprit.

  6. 06

    Next steps

    Scalp biopsy

    Reserved for suspected scarring alopecia, lichen planopilaris, frontal fibrosing alopecia or discoid lupus.

  7. 07

    Next steps

    Bloods where indicated

    Consider thyroid, liver and renal function if generalised pruritus or systemic features suggest an internal cause.

Typical timeline: a first visit to a working plan in weeks, not months.

Symptoms

What an itchy scalp actually looks like.

The features that separate simple dandruff from seborrhoeic dermatitis, psoriasis, tinea and the causes that need urgent attention.

  • White or yellow flakes

    Dry white flakes suggest simple dandruff. Greasy yellow scale on a red base points to seborrhoeic dermatitis.

  • Persistent itch

    The dominant symptom, often worse with stress, heat or product build-up.

  • Redness and irritation

    Erythema at the scalp, hair-line, eyebrows or behind the ears is typical of seborrhoeic dermatitis.

  • Thick silvery plaques

    Well-demarcated plaques extending beyond the hair-line suggest scalp psoriasis.

  • Patchy hair loss

    Circular patches with broken hairs raise tinea capitis. A boggy tender swelling is a kerion.

  • Lice, nits and pin-point bites

    Live lice or nits close to the scalp confirm head lice. Common in school-aged children.

  • Scarring or shiny bald patches

    Loss of follicular openings suggests scarring alopecia, lichen planopilaris or discoid lupus.

  • Red flag - scarring, systemic or refractory

    Scarring alopecia, systemic symptoms or scalp itch that ignores standard treatment needs specialist review.

Treatment

How itchy scalps are treated in the UK.

Medicated shampoos and topical steroids first, then calcineurin inhibitors, vitamin D analogues, oral antifungals or biologics depending on the underlying diagnosis.

  • Medicated shampoos

    Ketoconazole 2%, selenium sulfide 2.5%, zinc pyrithione, coal tar and ciclopirox. Rotate two to three times a week for four weeks then taper.

  • Topical corticosteroids

    Betamethasone valerate 0.1% scalp lotion or foam, clobetasol 0.05% shampoo or fluocinolone shampoo for inflamed disease.

  • Calcineurin inhibitors

    Tacrolimus or pimecrolimus as steroid-sparing options for the hair-line and face when long-term control is needed.

  • Scalp psoriasis regimens

    Vitamin D analogues (calcipotriol), coal tar, salicylic acid and steroid combinations such as Dovobet or Enstilar. Phototherapy or systemics for severe disease.

  • Tinea capitis

    Oral griseofulvin (children) or terbinafine under specialist mycology guidance. Topical treatment alone is not enough.

  • Head lice

    Dimethicone, malathion or permethrin plus wet combing. Treat the whole household on the same day where affected.

  • Contact avoidance

    Identify and remove the culprit product after patch testing. Switch to fragrance-free, preservative-safe alternatives.

  • Biologics and specialist input

    Dupilumab for severe atopic dermatitis with scalp involvement. Refractory or scarring disease belongs with dermatology.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or dermatologist knows your scalp and history and can tell you which parts apply to you. If in doubt, get seen.

  • NICE CKS. Seborrhoeic dermatitis.

  • NICE CKS. Psoriasis - scalp.

  • NICE CKS. Fungal skin infection - scalp (tinea capitis).

  • British Association of Dermatologists (BAD). Patient information leaflets on seborrhoeic dermatitis, scalp psoriasis and tinea capitis.

Red flags

When an itchy scalp needs urgent attention.

Most cases settle in primary care. These are the situations that don't - and where a specialist opinion is needed.

  • Scarring alopecia

    Loss of follicular openings, shiny scarred patches or a receding frontal hair-line suggests lichen planopilaris or frontal fibrosing alopecia. Early specialist review is essential.

  • Suspected tinea capitis

    Patchy hair loss with broken hairs, scale or a kerion in a child needs mycology sampling and oral antifungal therapy, not topical treatment alone.

  • Kerion

    A boggy, tender inflammatory mass on the scalp is a severe tinea reaction and needs urgent dermatology input.

  • Discoid lupus

    Scarring, hypopigmentation and photosensitivity across the scalp warrants biopsy and rheumatology or dermatology review.

  • Widespread crusted scabies

    Thickly crusted scalp lesions with generalised itch, especially in the immunosuppressed, need urgent treatment and public-health input.

  • Systemic pruritus with normal skin

    Persistent itch with no rash may reflect thyroid, liver, kidney or, rarely, lymphoproliferative disease and warrants bloods.

  • Refractory seborrhoeic dermatitis

    Failure of standard shampoos and topical steroids may need systemic itraconazole or a specialist review.

  • Contact allergy to hair dye

    Facial and scalp swelling after dyeing hair is a positive contact reaction, sometimes severe. Stop use and refer for patch testing.

  • Sudden severe hair loss

    Rapid diffuse or patchy hair loss on an inflamed scalp needs same-week dermatology assessment.

Living with it

A treatable condition, with a clear ladder.

Four things that make the biggest difference day to day - gentle routine, correct shampoo use, trigger awareness and asking for help early.

A quiet reminder

Consistency beats intensity, every time.

Small, steady habits kept up for months do more than a heroic week that doesn't last.

  1. 01 Routine

    Gentle, consistent care

    Fragrance-free shampoos, warm (not hot) water and minimal heat styling reduce baseline irritation.

  2. 02 Rotate

    Use medicated shampoos properly

    Leave the shampoo on the scalp for five minutes before rinsing. Rotate active ingredients to prevent tolerance.

  3. 03 Triggers

    Know your triggers

    Stress, cold weather, hair dye and product build-up all flare seborrhoeic dermatitis and psoriasis. Track patterns.

  4. 04 Support

    Ask for help early

    If shampoos and steroids are not enough, ask about calcineurin inhibitors, systemic therapy or a dermatology referral rather than living with itch.

Frequently asked

Everything we get asked about itchy scalps.

Quick answers on dandruff vs seborrhoeic dermatitis, medicated shampoos, scalp psoriasis and when to escalate.

  • What is the difference between dandruff and an itchy scalp?

    Dandruff is the mild end of a spectrum - small white flakes with little inflammation. An itchy scalp can be dandruff, but it can also be seborrhoeic dermatitis, scalp psoriasis, tinea capitis, contact allergy or head lice. The right treatment depends on the cause.

  • How do I tell seborrhoeic dermatitis from scalp psoriasis?

    Seborrhoeic dermatitis is typically greasy yellow scale on a red base at the hair-line, eyebrows and nasolabial folds. Scalp psoriasis is thick silvery well-demarcated plaques that often extend just past the hair-line, and it may be paired with nail changes or plaques elsewhere.

  • Which medicated shampoo should I try first?

    Ketoconazole 2% is a strong first-line option for seborrhoeic dermatitis and dandruff. Selenium sulfide, zinc pyrithione and coal tar shampoos are useful alternatives. Rotating between two actives two to three times a week works better than sticking to one.

  • When is an itchy scalp a red flag?

    Scarring or shiny bald patches, patchy hair loss with broken hairs, a boggy tender kerion, sudden severe hair loss or an itch that ignores standard treatment all warrant specialist assessment. Systemic itch with no rash should trigger bloods.

  • Can hair dye cause an itchy scalp?

    Yes. Paraphenylenediamine (PPD) in permanent dyes and preservatives like MI/MCI in shampoos are common causes of contact allergy. Patch testing identifies the culprit so you can avoid it.

  • What treats scalp psoriasis?

    Vitamin D analogues such as calcipotriol, coal tar, salicylic acid and steroid combinations like Dovobet or Enstilar are all used. Phototherapy, systemic treatment or biologics may be needed for severe or refractory disease under a dermatologist.

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