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Health condition · Clinically reviewed

Body skin problems and rashes, from everyday eczema to the flags that need urgent care.

A practical hub for rashes on the body. What is inflammatory, what is infective, what is urgent, and what modern UK dermatology can do about it.

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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, EADV and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK dermatology practice, including biologics, JAK inhibitors and 2WW skin-cancer pathways.

Key facts

Body rashes at a glance.

The essentials, in plain English. What causes most rashes, what is urgent, and what modern dermatology can offer.

  • What it covers

    A broad hub for rashes and skin problems on the body, from eczema and psoriasis through infections, urticaria and skin cancer.

  • Inflammatory group

    Eczema, contact dermatitis, seborrhoeic dermatitis, psoriasis, lichen planus and pityriasis rosea are the everyday drivers.

  • Infections

    Bacterial (impetigo, cellulitis), viral (chickenpox, shingles, warts), fungal (tinea, candida) and parasitic (scabies, lice).

  • Urgent presentations

    Cellulitis with sepsis features, blistering drug reactions and rapidly changing pigmented lesions need same-day review.

  • Skin cancer pathway

    Suspicious pigmented, non-healing, bleeding or fast-growing lesions go on the 2WW suspected skin-cancer pathway.

  • Modern therapies

    Biologics and small molecules have transformed severe eczema, psoriasis and chronic urticaria over the last decade.

Why this guide matters

One place, one framework.

Rashes can look alike but behave very differently. A shared framework helps you spot patterns and know when to escalate.

  • Inflammation, infection or something else

    Nearly every body rash fits into inflammatory, infective, urticarial, drug-related, autoimmune, vascular or neoplastic categories. Naming the group shapes everything else.

  • Distribution and morphology carry the answer

    Where a rash is, and what the individual lesions look like, usually points to the diagnosis long before any test.

  • Modern treatments have changed the game

    Biologics, JAK inhibitors, targeted immunotherapy and Mohs surgery have transformed severe skin disease and skin cancer in the last decade.

How the diagnosis is made

From first rash to a clear plan.

The steps a UK GP or dermatologist will usually follow, from clinical assessment through targeted tests to referral.

  1. 01

    Assessing

    Structured history

    Onset, progression, distribution, itch, triggers, occupation, travel, medications, family history and atopy shape the whole differential.

  2. 02

    Assessing

    Full-skin examination

    Morphology (macule, papule, plaque, vesicle, pustule, wheal, purpura), distribution and secondary change (scale, crust, lichenification).

  3. 03

    Assessing

    Dermoscopy

    A handheld magnifier that helps separate benign lesions from cancers and clarifies inflammatory patterns.

  4. 04

    Confirming

    Scrapings, KOH and Woods lamp

    Simple tests for suspected fungal or bacterial infection, and for pigmentary changes.

  5. 05

    Confirming

    Skin biopsy

    Punch or excisional biopsy for uncertain rashes, blistering disease or suspected skin cancer.

  6. 06

    Confirming

    Patch testing

    The definitive test for allergic contact dermatitis, done in a specialist clinic over a week.

  7. 07

    Escalating

    Bloods and 2WW referral

    Autoimmune, allergy and infection bloods where indicated. Suspicious lesions go on the 2WW skin-cancer pathway.

Typical timeline: common rashes settle a plan in one visit; complex cases need biopsy and specialist review.

Symptoms

What common rashes look like.

A visual shorthand for the patterns UK clinicians see day to day, plus the flags that mean it is time to escalate.

  • Itchy, dry, thickened patches

    Classic atopic eczema, often on flexures, with lichenification from chronic scratching.

  • Well-defined scaly plaques

    Psoriasis on the elbows, knees, scalp or lower back, sometimes with nail changes and joint pain.

  • Pustules, blisters or crusting

    Impetigo, folliculitis or herpes simplex/zoster, sometimes with fever or nerve pain.

  • Hot, spreading red area

    Cellulitis, often on a leg, with warmth, tenderness and sometimes fever. Same-day review.

  • Wheals and swelling

    Urticaria (hives) and angioedema, often itchy, moving around and lasting hours to days.

  • Rings, scale and hair loss

    Tinea (ringworm) on the body, groin, feet or scalp, sometimes with a raised advancing edge.

  • Changing pigmented lesion

    Asymmetry, border change, colour variation, diameter growth or evolution over weeks needs urgent review.

  • Red flag - blistering with mucosa

    Painful skin with mouth, eye or genital involvement after a new drug can be SJS or TEN. Emergency.

Treatment

How body skin problems are treated in the UK.

Emollients and topicals for the majority. Phototherapy, systemic immunomodulators and biologics for severe disease. Excision, Mohs and immunotherapy for skin cancer.

  • Emollients

    The foundation of care for dry, itchy or inflamed skin. Frequent, generous use is what makes them work.

  • Topical corticosteroids

    Mild to very potent, chosen to match the site and severity. Short bursts settle flares safely when used correctly.

  • Topical calcineurin inhibitors

    Tacrolimus and pimecrolimus are steroid-sparing options for eczema on the face, folds and eyelids.

  • Antihistamines

    Non-sedating antihistamines help itch in urticaria and, at higher doses, chronic spontaneous urticaria.

  • Antimicrobials

    Topical or oral treatment matched to the pathogen for bacterial, viral, fungal and parasitic skin infections.

  • Phototherapy

    Hospital-based narrowband UVB or PUVA for psoriasis, eczema, vitiligo and other selected conditions.

  • Systemic immunomodulators

    Methotrexate, ciclosporin, azathioprine, acitretin or apremilast for severe inflammatory skin disease.

  • Biologics and JAK inhibitors

    Dupilumab, tralokinumab, upadacitinib and others for severe eczema; multiple biologics for psoriasis; omalizumab for chronic urticaria.

What this guide is based on

The sources behind every claim on this page.

UK and European guidance, 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.

  • NICE. Eczema, psoriasis, cellulitis, urticaria and suspected cancer (NG12) guidelines.

  • British Association of Dermatologists (BAD). Patient information leaflets and treatment guidelines.

  • European Academy of Dermatology and Venereology (EADV). Guidelines on inflammatory skin disease.

  • MHRA. Safety updates on biologics, JAK inhibitors and severe cutaneous drug reactions.

Red flags

When a skin problem needs urgent care.

Most rashes are manageable in the community. These are the ones that need same-day or specialist attention.

  • Suspected melanoma or SCC

    New, changing, bleeding, non-healing or rapidly growing lesions need urgent review under the 2WW suspected skin-cancer pathway.

  • Cellulitis with sepsis features

    Rapidly spreading redness with fever, rigors, confusion or low blood pressure is a medical emergency.

  • Stevens-Johnson syndrome or TEN

    Painful skin, blisters and mouth or eye involvement after a new drug is an emergency needing hospital and drug withdrawal.

  • DRESS or AGEP

    Widespread rash with fever, facial swelling, lymph nodes or organ involvement after a new drug needs urgent specialist review.

  • Eczema herpeticum

    Sudden clusters of painful blisters and punched-out erosions on eczematous skin, often with fever, need same-day care.

  • Erythroderma

    More than 90 percent of the skin red and inflamed, with shivering or hypotension, is a dermatology emergency.

  • Purpura that does not blanch

    Non-blanching purpura with fever or systemic upset needs urgent assessment for vasculitis or meningococcal disease.

  • Necrotising infection

    Severe pain out of proportion, dusky skin, crepitus or rapid deterioration means immediate surgical review.

  • Immunosuppression plus infection

    Widespread or unusual infection in someone on biologics, chemotherapy or transplant medication needs urgent input.

Living with it

Skin that behaves better most of the time.

Four habits that make the biggest daily difference for people living with a chronic skin condition.

A quiet reminder

Small, steady care beats a heroic week.

Emollients, sun protection and knowing your triggers, done consistently, do more than any short burst of intensive treatment.

  1. 01 Routine

    Emollients are non-negotiable

    For any dry or inflamed skin, generous emollients used every day quietly do most of the heavy lifting.

  2. 02 Triggers

    Learn your flare pattern

    Heat, sweat, soap, fragrance, stress and specific allergens matter. Small tweaks add up.

  3. 03 Sun

    Sun protection every day

    Daily SPF prevents flares in photosensitive conditions and lowers long-term skin-cancer risk.

  4. 04 Escalate

    Do not accept ongoing misery

    If a skin problem is affecting sleep, work or mood, ask for a dermatology opinion. Modern therapies are transformative.

Frequently asked

Everything we get asked about body rashes.

Quick answers on inflammation, infection, urgency and modern treatments.

  • What causes most rashes on the body?

    Most everyday rashes are inflammatory (eczema, contact dermatitis, psoriasis, seborrhoeic dermatitis) or infective (viral, bacterial, fungal). Urticaria and drug reactions are also common. History and distribution usually narrow it down quickly.

  • When should a rash be seen urgently?

    Same-day review is needed for rapidly spreading cellulitis, blistering skin with mouth or eye involvement, non-blanching purpura with fever, widespread redness with systemic upset, or eczema suddenly turning painful and clustered (possible eczema herpeticum). Suspicious pigmented or non-healing lesions need urgent 2WW referral.

  • How is eczema treated in 2026?

    Emollients, topical steroids and calcineurin inhibitors remain the foundation. Severe disease is treated with phototherapy, ciclosporin or methotrexate, and increasingly with biologics such as dupilumab, tralokinumab and lebrikizumab, or oral JAK inhibitors such as upadacitinib, abrocitinib and baricitinib.

  • How is psoriasis treated?

    Topical steroids and vitamin D analogues for mild disease, phototherapy or systemic agents (methotrexate, ciclosporin, acitretin, apremilast) for moderate disease, and biologics (adalimumab, ustekinumab, secukinumab, ixekizumab, risankizumab, guselkumab, tildrakizumab, bimekizumab) for severe disease.

  • What is the 2WW skin-cancer pathway?

    A rapid NHS referral route where a GP refers anyone with a suspicious pigmented lesion, a non-healing sore, a rapidly growing or ulcerated lesion, or a bleeding skin lesion for a specialist opinion within two weeks.

  • Are biologics safe long-term?

    Modern biologics have a strong safety record when used with UK monitoring protocols. Baseline screening (including TB and hepatitis), vaccination review and regular follow-up are standard. Report any new infections, unusual symptoms or planned pregnancy to your team early.

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