An itchy, flaky, sore or spotty scalp is miserable on its own. Paired with shedding, it raises a sharper question: is the scalp condition causing the hair loss, or are two separate things happening at once? The answer decides the treatment — and it’s genuinely answerable, usually within minutes under magnification.
This page covers the scalp conditions we see most in clinic — seborrhoeic dermatitis, scalp psoriasis, folliculitis and the dry, irritated scalp that mimics them — what each actually does to hair, and how a doctor treats both the skin and the shedding rather than sending you away with a shampoo recommendation.
- – Ordinary dandruff rarely costs hair — but the inflammation behind seborrhoeic dermatitis and psoriasis can, and the scratching usually makes it worse
- – Hair lost to most inflammatory scalp conditions grows back once the inflammation is treated — the exception is untreated folliculitis, which can scar
- – The itch–scratch–shed cycle is real: broken hairs and traumatised follicles from scratching often outnumber the loss from the condition itself
- – Scalp symptoms plus shedding needs both examined together — treating the flakes while missing a coexisting pattern loss or deficiency wastes months
- – Dr Amy treats the common inflammatory scalp conditions and their hair impact directly, and refers to dermatology — with a proper letter — where a condition needs specialist care
The scalp conditions that actually cause hair loss
Seborrhoeic dermatitis is the inflamed, big-brother version of dandruff — greasy yellowish scale, red itchy skin, driven by an overreaction to the Malassezia yeast that lives on every scalp. The inflammation can push follicles into shedding, and the scratching breaks hairs on top. Scalp psoriasis builds thick, silvery, well-defined plaques; hair caught in plaques sheds or breaks, and picking the scale away takes hair with it — but psoriasis loss is almost always temporary once the plaques are treated. Folliculitis — infected or inflamed follicles showing as pustules or tender spots — is the one to take most seriously: treated promptly it clears, but deep or repeated bouts can scar follicles closed permanently. And a large group of itchy scalps turn out to be none of these: simple irritant reactions to products, or a dry scalp mistaken for dandruff and treated with exactly the wrong shampoo.
| Condition | What it looks and feels like | Does it cost hair? | What treats it |
|---|---|---|---|
| Seborrhoeic dermatitis | Greasy yellow flakes, red itchy skin, worse in cold months and stress | Can — shedding from inflammation plus breakage from scratching; reversible | Medicated antifungal shampoos used correctly, short courses of topical steroid for flares |
| Scalp psoriasis | Thick silvery plaques with sharp edges, sometimes beyond the hairline | Yes while active — regrows once plaques clear; scratching and picking worsen it | Prescription topicals; dermatology referral for severe or widespread disease |
| Folliculitis | Pustules, tender spots, sometimes crusting around follicles | Can scar follicles permanently if deep or repeated — treat early | Antimicrobial treatment promptly; investigation if it keeps returning |
| Tinea capitis (scalp ringworm) | Scaly patches with broken ‘black dot’ hairs; itch; sometimes tender glands | Yes while active — reversible if treated before scarring; the inflamed kerion form scars | Oral antifungals only — creams cannot reach it; household checks |
| Dry / irritated scalp | Fine white flakes, tightness, itch without redness or grease | Rarely directly — but the scratching breaks hair | Stop the offending products; restore the barrier; treat what’s actually there |
Honest scope: Dr Amy diagnoses and treats these conditions and their hair impact as a doctor with specialist hair training. Severe, widespread or atypical disease — especially psoriasis needing systemic treatment or anything that might be a scarring process — is referred to dermatology with a full letter, while your hair care continues here.
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Itch, scratch, shed: the cycle that does the real damage
Ask a woman with a flaring scalp where her hair went and she’ll blame the condition; under magnification, half the story is usually mechanical. Scratching snaps shafts, inflames follicles and — sustained for months — produces a shedding pattern of its own on top of the original problem, close cousin to telogen effluvium. Breaking the cycle is therefore treatment in itself: calm the inflammation properly (a medicated shampoo lathered and rinsed immediately does nothing — contact time is the whole trick), and the scratching stops because the itch does. Our itchy scalp guide covers the self-care layer; the clinic exists for when self-care hasn’t worked.
When it isn’t the scalp at all
The flakes are visible, so the flakes get blamed — but scalps and follicles fail independently, and often simultaneously. A woman with mild seborrhoeic dermatitis and heavy shedding frequently turns out to have low ferritin, a thyroid drifting out of range, or early pattern hair loss that the scalp condition merely unmasked. This is why the consultation examines both layers: the skin under magnification, and the follicle behaviour beneath it, with blood tests where the pattern points deeper. Treating the dandruff while the ferritin sits at 12 is how a treatable shed becomes a year-long one.
How to describe your scalp — the details that speed up diagnosis
Scalp conditions are diagnosed faster when the story is specific, so here’s what’s actually useful to note before an appointment. Where: all over, or in defined patches? Hairline, crown, behind the ears? What the flakes are like: fine and white, or greasy and yellowish, or thick and silvery — this single detail separates the three big conditions better than almost anything else. What it feels like: itch, tightness, soreness, burning — and burning matters more than people realise. The timeline: weeks, months or years; steady or flaring; any link to stress, seasons, or a product change. What you’ve tried: which shampoos, used how often, left on for how long — because “used correctly for six weeks” and “lathered and rinsed twice” are different experiments. Five sentences covering those five points does more diagnostic work than most referral letters.
The symptoms that shouldn’t wait
Most scalp conditions are uncomfortable rather than urgent — but a short list earns a prompt examination rather than a patient one. Burning, tenderness or soreness with thinning at the crown or hairline: this combination is how scarring alopecias announce themselves, and they permanently take what they take before treatment stops them. Pustules that keep returning in the same area — folliculitis’s scarring risk accumulates with each round. An expanding smooth, shiny patch where follicle openings seem to have vanished: possible scarring, needs magnified examination this month, not this year. Localised scale with broken ‘black dot’ stubble — the signature of scalp ringworm, which spreads and needs oral treatment. None of these is a reason to panic; every one is a reason to be seen quickly, because in each case early treatment protects hair that late treatment cannot recover.
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What happens at your consultation
Trichoscopy settles most of it quickly — seborrhoeic scale, psoriatic plaque, folliculitis pustules and simple dryness look entirely different at magnification, and so do the follicles underneath. You leave with the condition named, prescription treatment where needed, the technique that makes medicated shampoos actually work, and a plan for the hair itself: what will regrow on its own, what needs support, and when we photograph and review. If dermatology input is the right call, the referral letter is written there and then — and if you are unsure whether a scalp problem is something we see, message the clinic on WhatsApp and ask.
Not sure where to start? Ask the clinic first.
Dr Amy Vowler · GMC-registered GP · GMC 7451097
Message us on WhatsApp or give us a ring. We can't give clinical advice over a message, but we can tell you how the consultation works, what it costs and whether Dr Amy is the right person for you. No obligation, nothing to prepare.
It can — through inflammation around the follicles and through the scratching it provokes — and the loss is reversible in almost all cases once the condition is controlled. The practical failure point is treatment technique: antifungal shampoos only work with several minutes of contact time on the scalp, which almost nobody is told. If your shedding continues after the flaking is controlled, that’s the signal to look for a second cause alongside it, which is exactly what a consultation checks.
Very rarely. Psoriasis itself doesn’t usually destroy follicles — hair caught in plaques sheds or breaks, and regrows once the plaques are treated. The two habits that risk longer-term damage are picking and lifting the scale (which pulls hair and traumatises follicles) and leaving severe disease untreated for years. Effective prescription treatment exists, and severe scalp psoriasis warranting systemic therapy gets a dermatology referral with your hair monitored alongside.
It’s the one common scalp condition where the answer can be yes — deep or repeatedly recurring folliculitis can scar follicles closed, and scarred follicles don’t regrow. That makes it the condition least suited to waiting: tender spots or pustules that keep appearing deserve prompt treatment and, where they keep returning, investigation of why. Caught early, folliculitis clears without any lasting loss.
Soreness plus shedding has a shortlist: an inflammatory scalp condition (seborrhoeic dermatitis, psoriasis, folliculitis), a sensitised scalp from products or scratching, and — importantly — some hair loss conditions themselves cause scalp sensations, including the tenderness some women feel with heavy shedding and the burning or itch of scarring alopecias, which need early diagnosis. Because that shortlist spans ‘irritating but harmless’ to ‘needs treatment this month’, a sore shedding scalp is a good reason for an examination rather than another shampoo experiment.
Dandruff (mild seborrhoeic dermatitis) is oily — greasy yellowish flakes on a scalp that’s red and itchy, driven by yeast overgrowth — and improves with antifungal shampoo. A dry scalp produces fine white flakes with tightness, often from harsh products or over-washing, and antifungal shampoos can make it worse. They’re treated oppositely, which is why guessing wrong keeps so many people flaky: one look under magnification tells them apart.
When it’s paired with shedding; when it’s sore, pustular or crusted; when over-the-counter shampoos used properly for six weeks haven’t fixed it; or when there’s any burning, tenderness or itch with thinning at the crown or hairline — the pattern that needs scarring alopecia excluded early. A doctor can prescribe what pharmacy shelves can’t, treat the hair impact alongside the skin, and refer to dermatology properly where specialist care is needed.
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