Health condition · Clinically reviewed
Psoriasis, a chronic autoimmune skin condition — with modern biologics.
Not just a rash — an immune-mediated inflammatory disease with skin, joint and cardiovascular impact. Modern biologics can clear the skin almost completely for many patients.
Why trust this guide
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Clinically reviewed
Written by our editorial team and reviewed by a registered UK clinician before publication.
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Sourced from guidance
Checked against NICE, BAD and peer-reviewed sources you can see at the end.
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Current for 2026
Reflects modern UK guidance including IL-17, IL-23 biologics and JAK inhibitors.
Key facts
Psoriasis at a glance.
The essentials, in plain English — what it is, how common it is, how it’s diagnosed, and how it’s treated in the UK today.
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What it is
A chronic, immune-mediated inflammatory skin disease driven by an overactive IL-23/IL-17 immune axis.
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How common
Affects around 1.5-3% of the UK population — over a million people.
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Main subtypes
Plaque, guttate, pustular and erythrodermic — plus scalp, flexural and nail patterns.
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Joint involvement
Around 1 in 3 people with psoriasis develop psoriatic arthritis at some point.
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Whole-body impact
Associated with cardiovascular disease, metabolic syndrome, depression and inflammatory bowel disease.
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Modern treatment
IL-17 and IL-23 biologics can clear the skin almost completely for many patients — a transformation in care.
Why this guide matters
More than skin — and now, more than steroids.
Psoriasis is common, systemic and — for most people — highly treatable. The three points below shape everything else on this page.
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It’s a systemic disease
Skin, joints, cardiovascular risk and mood are all part of the same immune process.
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Screen for psoriatic arthritis
Around 1 in 3 patients develop joint disease — earlier treatment protects joints.
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Modern biologics change outcomes
IL-17 and IL-23 inhibitors can give near-clear skin — don’t assume topicals are the only option.
How the diagnosis is made
From first plaque to a clear plan.
The steps a UK GP or dermatologist will normally follow, in order — so you know what to expect and why.
Phase 1 · Assessing
Severity, life impact and joint screen
Phase 2 · Investigating
Joint imaging and cardiometabolic risk
Phase 3 · Managing
Specialist care and biologic screening
- 01
Assessing
Skin exam + PASI/BSA score
A dermatologist grades severity by Psoriasis Area and Severity Index and body-surface-area involvement.
- 02
Assessing
DLQI life-impact questionnaire
The Dermatology Life Quality Index captures how the disease affects work, sleep, mood and relationships.
- 03
Assessing
Screen for psoriatic arthritis
A short PEST questionnaire flags joint disease that needs earlier rheumatology input.
- 04
Investigating
Joint imaging if PsA suspected
Ultrasound or MRI of affected joints looks for synovitis, enthesitis and early erosive change.
- 05
Investigating
Cardiovascular + metabolic screen
Blood pressure, lipids, HbA1c and BMI — psoriasis carries a real cardiometabolic risk.
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Managing
Dermatology consultation
A specialist matches subtype, severity and life impact to the right rung of the treatment ladder.
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Managing
Screening before biologics
TB, HIV and hepatitis B screening is standard before starting any biologic or JAK inhibitor.
Typical timeline: a first visit to a settled plan in weeks, not months.
Symptoms
What psoriasis actually looks and feels like.
The main subtypes and patterns of psoriasis — and the features that mean it’s time to escalate.
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Plaque psoriasis
Well-defined, red or violaceous plaques with silvery scale — usually elbows, knees, lower back and scalp.
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Guttate psoriasis
Small, drop-like lesions across the trunk — often triggered by a streptococcal throat infection.
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Pustular psoriasis
Sterile pustules on palms and soles (localised) or across the body (generalised — a medical emergency).
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Scalp psoriasis
Thick, scaly plaques along the hairline — often itchy, sometimes mistaken for stubborn dandruff.
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Nail changes
Pitting, onycholysis (lifting) and subungual hyperkeratosis — a strong marker of psoriatic arthritis risk.
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Psoriatic arthritis
Joint pain, stiffness, dactylitis (sausage digits) and enthesitis — affects about 1 in 3 patients.
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Erythrodermic psoriasis
Redness and scaling covering almost the whole body — a life-threatening dermatological emergency.
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Red-flag features
Erythrodermic or generalised pustular psoriasis needs same-day dermatology assessment — call 999 or attend A&E.
Treatment
How psoriasis is treated in the UK.
A stepwise ladder from topicals and phototherapy to methotrexate, IL-17 and IL-23 biologics and JAK inhibitors — with cardiometabolic care in parallel.
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Topical steroids + vitamin D
Potent corticosteroids combined with calcipotriol are first-line for mild to moderate plaque disease.
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Coal tar preparations
A long-standing option that reduces scale and inflammation — still useful for scalp and stable plaques.
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Phototherapy (NB-UVB)
Narrow-band ultraviolet B in specialist care for moderate disease not controlled by topicals.
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Methotrexate
A well-established oral systemic — useful for skin and joint disease, with blood monitoring.
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Ciclosporin
A fast-acting oral immunosuppressant, typically used short-term to gain control of severe flares.
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Biologics (IL-17 / IL-23)
Secukinumab, risankizumab and guselkumab deliver near-clear skin for many patients with severe disease.
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JAK inhibitors
Deucravacitinib and other oral small molecules — a newer targeted option for moderate-to-severe plaque disease.
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Manage CV / metabolic risk
Blood pressure, lipids, weight and smoking — treating them matters as much as treating the skin.
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 skin and history and can tell you which parts apply to you. If in doubt, get seen.
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NICE. Psoriasis: assessment and management (CG153).
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British Association of Dermatologists (BAD). Patient information and biologic guidelines.
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Psoriasis Association. Patient information and support.
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European Society of Dermatology and Venereology (EADV). European psoriasis guidance.
Red flags
When psoriasis needs urgent attention.
Most of the time, psoriasis is a manageable long-term condition. These are the situations where it isn’t — and you should act today.
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Erythrodermic psoriasis
Redness and scaling covering most of the body — a medical emergency needing same-day dermatology or A&E.
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Generalised pustular psoriasis
Widespread sterile pustules with fever and malaise — hospital-level care and often a biologic like spesolimab.
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New joint pain or swelling
Suggests psoriatic arthritis — early rheumatology review protects joints from lasting damage.
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Infection while on a biologic
Fever, sore throat or unusual infection while on a biologic or JAK inhibitor — contact your specialist team promptly.
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New eye pain, redness or blur
Possible uveitis, which is associated with psoriatic disease — urgent same-day ophthalmology assessment.
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Chest pain or stroke-like symptoms
Psoriasis raises cardiovascular risk — treat sudden chest pain or neurological symptoms as an emergency (999).
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Pregnancy on systemic therapy
Methotrexate and several systemics are teratogenic — plan pregnancy in advance with your dermatologist.
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Depression or suicidal thoughts
Psoriasis carries a real mental-health burden — talk to your GP; effective treatment helps skin and mood.
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Withdrawal flare after stopping steroids
Sudden stopping of oral or very potent topical steroids can trigger a severe rebound — never stop abruptly.
Living with it
A long-term condition, but a very manageable one.
Four things that make the biggest difference day to day — barrier care, gentle washing, trigger awareness and knowing when to step up.
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.
- 01 Barrier
Moisturise like it’s medicine
Regular emollients reduce scale, itch and cracking — and make active treatments work better.
- 02 Wash
Cool and short
Cool, brief showers with soap-free wash — hot baths and harsh products worsen plaques.
- 03 Triggers
Know your own
Stress, throat infections, smoking, heavy alcohol and certain drugs (lithium, beta-blockers) can trigger flares.
- 04 Escalate
Don’t put up with it
If topicals aren’t enough, modern biologics and JAK inhibitors can transform severe psoriasis.
Frequently asked
Everything we get asked about psoriasis.
Quick answers on biologics, psoriatic arthritis, heart-disease risk and when to worry.
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What is psoriasis?
A chronic, immune-mediated inflammatory disease driven by an overactive IL-23/IL-17 immune axis. It shows on the skin but affects joints, cardiovascular risk and mood too.
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Is psoriasis contagious?
No. Psoriasis is an immune-driven condition — you cannot catch it or pass it on through touch.
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What is psoriatic arthritis?
An inflammatory arthritis linked to psoriasis, affecting around 1 in 3 patients. Early diagnosis and treatment prevent lasting joint damage.
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How well do biologics work?
IL-17 and IL-23 biologics achieve PASI 90 — 90% clearance — in the majority of patients, and many reach completely clear skin.
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Do I need any tests before starting a biologic?
Yes — screening for tuberculosis, HIV and hepatitis B is standard, along with routine bloods, before any biologic or JAK inhibitor.
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Does psoriasis raise my heart-disease risk?
Moderate-to-severe psoriasis is associated with higher cardiovascular and metabolic risk. Blood pressure, cholesterol, weight and smoking all deserve attention.
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