In short
- The commonest London causes: seborrheic dermatitis, dry scalp, product build-up, hard water, contact allergy.
- Anti-dandruff shampoo on a non-dandruff itch usually worsens the itch within 2 weeks.
- A trichology consult (£120–£180) shortens the trial-and-error phase from months to days.
- Persistent scalp itching with hair loss needs a clinical opinion within weeks, not months.
Scalp itching is one of the most common complaints in London hair clinics. The instinct is to reach for anti-dandruff shampoo — which helps in maybe a third of cases and worsens the rest. Diagnosis first, then treatment.
The ten common causes
- Seborrheic dermatitis (greasy yellow flakes, redness).
- Simple dry scalp (small white flakes, tight feel).
- Product build-up (persistent itch that worsens between washes).
- London hard water (barrier disruption).
- Contact allergy — fragrance, formaldehyde-releasers, PPD in dye.
- Psoriasis (thick silvery plaques, often extends to hairline).
- Folliculitis (small pustules around follicles).
- Head lice (surprisingly common in London family households).
- Stress-triggered neurogenic itch (no visible cause).
- Traction/tension from tight styles.
The self-triage
Flakes yellow and greasy → try 1% ketoconazole shampoo 2x weekly. Flakes small and white → hydrate, sulfate-free, ceramide serum. No flakes but persistent itch → suspect build-up or allergy, do a clarifying wash and remove one product at a time. Pustules or bald patches → book a trichologist within 2 weeks.
When to escalate
Any itch persisting past 6 weeks, any accompanying hair loss, any pustules, or any spread beyond the scalp warrants a clinical opinion. A London trichology consult with trichoscopy is the fastest route to a real diagnosis.
The scalp itches for a reason. Guessing which reason costs more than asking.
Frequently asked
Common questions
Can stress cause scalp itching?+
Yes — neurogenic itch is real, though usually a diagnosis of exclusion after ruling out physical causes.
Are natural shampoos always better?+
No — essential oils are among the most common contact allergens for the scalp.
Should I stop dyeing my hair?+
If the itch started after a colour service, pause and see a trichologist. PPD allergy is common and progressive.
Keep reading
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