Skin rashes are one of the most common reasons people turn to the NHS for answers, especially when there is a child involved. This guide pulls together NHS-backed visual tools, comparison pictures, and clear urgency guidance so you can tell the difference between something harmless and something that needs attention today.

4 related posts

Common skin rashes pictured: 32 types (Prevention) · NHS rashes tool available: Images and summaries (111.wales.nhs.uk) · Rash pictures documented: 71 symptoms (MedicalNewsToday) · Common rashes listed: 22 types (Healthline) · Visual guides for children: NHS and NHSGGC resources

Quick snapshot

1Confirmed facts
  • The NHS provides rash images and summaries on its main pages for babies, children, and adults (NHS)
  • On brown and black skin, rashes may be easier to see on soles of feet, palms, lips, tongue, and eyelids (NHS)
  • Most rashes in children are harmless and resolve on their own (Healthier Together NHS)
2What’s unclear
  • Exact diagnosis from pictures alone requires a doctor
  • Specific publication dates for some NHS rash pages are not publicly listed
  • Quantitative prevalence data for each individual rash type is limited
3What happens next
  • Use the NHS 111 Wales rash checker tool to compare your rash against clinical images
  • Apply the glass test if any rash appears suddenly or with illness
  • Seek a GP or call 111 for any rash that does not fade under glass pressure
4When to worry
  • Call 999 if rash with swollen lips or tongue, or if it does not fade under a glass (Alder Hey Children’s Hospital)
  • Infants under 3 months with temperature 38C need urgent GP or 111 call (NHS)
  • Scarlet fever is classified as a medical emergency requiring urgent care (Healthline)

The following table consolidates the most clinically relevant NHS and clinical resources for rash identification, ranked by source authority and UK applicability.

Resource What it covers
NHS — Rashes in babies and children 32+ rash types, skin tone guidance, glass test, temperature thresholds
NHS 111 Wales — Skin Rashes Tool Interactive tool with clinical images and treatment summaries
Prevention — 32 Rash Pictures Visual identification guide with 32 rash types across skin tones
Royal Hospital for Children Glasgow — Visual Guide Visual guide specifically for babies and children, including viral rashes
MedicalNewsToday — 71 Rash Symptoms Comprehensive symptom documentation across 71 conditions
Healthline — 22 Common Rashes Descriptions and pictures of 22 common rash types
Alder Hey Children’s Hospital — Symptom Checker Emergency flags, glass test instructions, when to call 999

What kind of rashes are serious?

Not every rash means something alarming. The NHS notes that most rashes in children are harmless and clear up on their own. However, certain signs call for immediate action. The NHS guidance on rashes in babies and children identifies clear red-flag conditions that require urgent medical attention, particularly when they appear alongside fever, breathing difficulty, or sudden onset.

Signs of serious rashes

  • Meningococcal rash: appears as small bruises or bleeding under the skin that does not fade when you press a glass against it (NHS). This is one of the most time-sensitive rash emergencies.
  • Scarlet fever: presents with a rash like sandpaper and a bright red tongue. Healthline classifies scarlet fever as a medical emergency requiring urgent care.
  • Hives (urticaria): itchy raised bumps or patches, pink or red on white skin, harder to see on brown or black skin. While often allergic, sudden widespread hives with breathing difficulty need 999.
  • Measles rash: starts on the face and behind ears, spreads to the body in blotchy patches that are not typically itchy (NHS). Measles is highly contagious and requires isolation and medical review.

When to seek medical help

  • Call 999 immediately if the rash is accompanied by swollen lips or tongue, or if it fails the glass test (Alder Hey Children’s Hospital).
  • Infants under 3 months with a temperature of 38C or above require an urgent GP appointment or a call to NHS 111 (NHS).
  • Children aged 3 to 6 months with a temperature of 39C or above also need prompt attention (Healthier Together NHS).
  • Any rash covering more than 90% of the body, or a fever lasting over 5 days at 38C, warrants a doctor’s visit (Healthier Together NHS).
The catch

Rashes on darker skin tones can look dramatically different than on white skin. Where redness shows up clearly on lighter complexions, rashes may appear grey, purple, or brown — or show first on palms, soles, or eyelids where colour contrast is more visible.

Bottom line: The implication: urgency thresholds apply to everyone, but visual recognition of serious rashes requires adjusting your expectations based on skin tone. This is not widely taught in first-aid materials, which has historically led to delayed diagnosis in people of colour.

How do I identify the rash that I have?

Visual identification starts with comparing your rash against clinical images from trusted sources. The NHS provides several tools specifically designed for this — from text-heavy condition pages to an interactive picture-based checker in Wales. Understanding how to describe what you see will sharpen your results when using these tools.

Visual identification steps

  • Shape and morphology: Is the rash flat, raised, blistered, or scaly? The Royal College of Emergency Medicine guide recommends starting with morphology — the basic form of the lesion.
  • Distribution: Where on the body did it start, and how has it spread? Measles, for instance, begins on the face and behind the ears before spreading downward (NHS).
  • Texture and colour: Is the skin cracked, weeping, or blistered? On white skin, rashes typically appear red or pink. On brown or black skin, they may look grey, purple, or white rather than red (HSE Ireland).
  • Associated symptoms: Is it itchy, painful, or does it feel like prickly heat? Heat rash presents with a characteristic prickly feeling and small raised spots (NHS).

Using rash pictures for comparison

The NHS 111 Wales skin rashes tool pairs images of common rashes with concise treatment summaries. Prevention.com documents 32 rash picture types across varying skin tones. MedicalNewsToday covers 71 rash symptoms with descriptive text. Healthline lists 22 common rash types with pictures and clinical context.

  • NHS 111 Wales tool: Best for UK readers wanting quick NHS-backed visual triage.
  • Prevention picture guide: Useful for comparing your rash against 32 documented examples.
  • RHCG visual guide: Specialised for parents of babies and children, with emphasis on viral rashes.
Bottom line: Comparing your rash to clinical images narrows down possibilities, but picture-matching is not diagnosis. Use NHS tools as a first step, not a final answer. When in doubt, the safest next step is a GP or 111 call.

What does a bacterial rash look like?

Bacterial rashes tend to look different from viral or fungal ones, but the distinctions are not always obvious without clinical context. Two bacterial rash patterns appear frequently in UK clinical guidance: impetigo and scarlet fever.

Bacterial infection visuals

  • Impetigo: Typically appears around the mouth and nose with honey-coloured crusting. It is most common in children aged 2 to 5 years (Healthline). The crusting — described as honey-coloured — is the key visual marker that distinguishes it from other red rashes.
  • Scarlet fever: Presents as a sandpaper-textured rash, often accompanied by a bright red tongue (sometimes called “strawberry tongue”). This combination of skin and oral symptoms is distinctive. Healthline notes that scarlet fever is a medical emergency.
  • Meningococcal disease: The rash starts as small red spots that rapidly become bruise-like or petechial. The defining feature is that pressing a clear glass against the rash causes no fading — the so-called glass test (NHS).

Differences from fungal or viral

  • Fungal rashes such as ringworm typically present as circular, scaly patches with a clearer border — often described as ring-shaped. The NHS provides ringworm imagery and guidance.
  • Viral rashes in children are harder to pinpoint to a specific virus. The Royal Hospital for Children Glasgow notes that viral rashes from various sources are common and often difficult to distinguish without laboratory testing.
  • The RCEM guide on dermatological description recommends describing rashes systematically by morphology, arrangement, distribution, and colour — a framework that applies whether the cause is bacterial, viral, or fungal.
Why this matters

Bacterial rashes are the ones most likely to respond to specific treatments — impetigo to antibiotic creams, scarlet fever to penicillin. Viral and fungal rashes are managed supportively. Getting the category right, even roughly, shapes whether you push for a GP appointment or manage at home.

Bottom line: The pattern: bacterial rashes respond to targeted antibiotics, while viral and fungal rashes require supportive care — knowing which category applies determines whether you seek immediate treatment or manage symptoms at home.

What does a cancerous rash look like?

Cancerous skin rashes are uncommon, but they do occur and early recognition matters. The research notes indicate limited detail on exact visual characteristics, which itself is an important signal — skin cancer identification typically relies on the ABCDE framework for moles rather than broad rash descriptions.

Cancerous rash characteristics

  • Skin cancers presenting as rashes are most often basal cell carcinoma, squamous cell carcinoma, or melanoma. These may appear as persistent, non-healing patches, unusual pigmentation, or changes in existing skin lesions.
  • The NHS Digital guidance on inclusive symptom assessment recommends prioritising shape, size, spread, and texture for any skin symptom — guidance that applies equally to potentially malignant presentations.
  • Prevention.com notes that rashes that appear suddenly, spread rapidly, or fail to respond to standard treatments warrant professional review. Persistent skin changes over weeks or months, particularly in sun-exposed areas, should be assessed by a dermatologist.

When to worry about malignancy

  • A rash that does not match any common pattern — and does not fade with typical emollient or antihistamine treatment — deserves a GP review.
  • Any new pigmented lesion with irregular borders, multiple colours, or asymmetric shape should prompt an urgent skin check.
  • Rashes in areas of chronic sun exposure that change over time, bleed spontaneously, or become raised warrant dermatologist referral.

The implication: most rashes are benign, but persistent, changing, or treatment-resistant skin lesions deserve professional assessment — catching malignant presentations early significantly improves outcomes.

Can I take a picture of my rash and see what it is?

Smartphone cameras have made it tempting to photograph a suspicious rash and search for a match online. Several tools now exist to support this process, ranging from NHS-backed symptom checkers to dedicated skin-health apps.

Rash identification apps

  • NHS 111 Wales skin rashes tool: This is the most clinically trusted option for UK readers. It presents clinical images alongside treatment summaries, allowing comparison without leaving NHS guidance. The tool is available at 111.wales.nhs.uk.
  • Alder Hey Symptom Checker: Specialised for children’s rashes, this symptom checker from Alder Hey Children’s Hospital walks parents through urgency flags including the glass test.
  • RHCG visual guide: The Royal Hospital for Children Glasgow provides a picture-based resource specifically for babies and children, with emphasis on viral presentations.
  • Prevention picture guide: With 32 documented rash pictures, this is a useful cross-referencing tool for adults comparing their symptoms to clinical examples.

NHS checker tools

  • The NHS does not currently offer a national AI-powered rash identification app. The most reliable NHS-backed tools are symptom checkers — text and image resources that guide you through decision trees rather than analysing uploaded photos.
  • The HSE Ireland rash pages provide a parallel resource for Irish readers, with similar rash types and skin-tone guidance as the NHS.
  • WebMD offers a slideshow on common childhood skin problems, though this is not NHS-backed and should be used as a secondary reference.
The trade-off

Picture-matching tools work best for rashes that match common, well-documented patterns. Rare presentations, rashes on darker skin tones, and early-stage conditions are harder to identify from photos alone. No app replaces a clinician who can examine, take a history, and order tests if needed.

How to use NHS rash picture tools

A step-by-step approach to comparing your rash against NHS-backed visual resources.

  1. Observe the rash: Before opening any tool, note the shape, texture, location, and any associated symptoms such as itching, pain, or fever. The NHS Digital inclusive content guidance recommends prioritising shape, size, spread, and texture when assessing skin symptoms.
  2. Perform the glass test (if relevant): If the rash appeared suddenly or alongside illness, press a clear drinking glass firmly against the skin. If the rash does not fade under pressure, call 999 immediately.
  3. Open the NHS 111 Wales rash tool: Navigate to 111.wales.nhs.uk/livewell/SkinRashes/ and scroll to the image gallery relevant to your symptoms.
  4. Compare your rash to the images: Look for matches in shape, colour, texture, and location. Note the treatment summary provided alongside each image.
  5. Cross-reference with Healthline or Prevention: If the NHS tool does not show a close match, check Healthline’s 22 common rashes or Prevention’s 32 rash picture guide.
  6. Check urgency thresholds: Refer to the serious rash indicators above — temperature thresholds, glass test, body coverage — and act on any red flags before deciding whether to self-manage.
  7. Book a GP appointment or call 111: If the rash matches a serious pattern, is worsening, or does not match any documented type, seek professional review. Do not rely on picture-matching alone for diagnosis.

Confirmed facts

  • The NHS provides rash images and summaries for babies, children, and adults on its main condition pages
  • On brown and black skin, rashes may be more visible on palms, soles, lips, tongue, and eyelids
  • Most rashes in children are harmless and resolve without treatment
  • Infants under 3 months with temperature 38C require urgent GP or 111 contact
  • Scarlet fever is classified as a medical emergency
  • The glass test is the primary at-home indicator for meningococcal rash
  • NHS 111 Wales offers an interactive rash identification tool with images

What’s unclear

  • Exact diagnosis from pictures alone is not possible without clinical examination
  • Specific publication dates for some NHS rash pages are not publicly listed
  • Quantitative prevalence data for individual rash types is limited in public NHS resources
  • Detailed treatment protocols beyond urgency warnings are not included on all NHS rash pages

What the experts say

The rash looks like small bruises or bleeding under the skin and does not fade when you press a glass against it.

— NHS (UK National Health Service), NHS guidance on rashes in babies and children For further details on the history of Coca-Cola and its connection to cocaine, you can explore the Cola Mythos Kokain Geschichte.

Most rashes are harmless and go away on their own.

— Hertfordshire and West Essex Healthier Together (NHS Partnership), Healthier Together NHS

Scarlet fever is a medical emergency. Urgent care is required.

— Healthline (Medical Resource), Healthline rash overview

Bottom line: NHS-backed rash picture tools are a reliable first step for UK readers, but they guide triage, not diagnosis. Parents of young children should treat fever-plus-rash as a medical priority — infants under 3 months with 38C or a failed glass test warrant an immediate 999 call. Adults with persistent, unusual, or treatment-resistant skin changes should book a GP appointment rather than relying on picture-matching alone.

Related reading: food allergies and skin rashes · metal contact rashes

NHS sources like the 111 Wales tool offer essential images, while a detailed visual rash guide provides expanded views on types, causes, and urgency indicators for all ages.

Don't miss these

Frequently asked questions

What illnesses start with a rash?

Many viral illnesses in children present with a rash as an early or primary symptom. Common examples include chickenpox (pink spots that become blisters), measles (starts on face and behind ears), hand foot and mouth disease (red spots on hands, feet, and mouth), and slapped cheek syndrome (round red rash on cheeks followed by a lacy body rash). The Royal Hospital for Children Glasgow notes that viral rashes from various sources are common in children and can be difficult to distinguish without testing.

What does a disease rash look like?

Disease rashes vary widely. Measles produces blotchy patches that start on the face and behind the ears and spread downward. Chickenpox begins as pink or red spots that quickly turn into fluid-filled blisters. Meningococcal disease causes a rash that looks like small bruises or bleeding under the skin and does not fade when pressed with a glass. On darker skin tones, these rashes may appear grey, purple, or brown rather than red, making visual comparison tools essential for accurate recognition.

What kind of rashes are concerning?

Any rash accompanied by a high fever in an infant, a rash that fails the glass test, widespread hives with breathing difficulty, or a sandpaper-textured rash with a bright red tongue (scarlet fever) is concerning and requires urgent care. Rashes covering more than 90% of the body, rashes with blistered or weeping skin, or rashes that persist without explanation beyond expected healing timelines also warrant a GP visit.

What are skin rashes that itch?

Common itchy rashes include hives (urticaria), heat rash (prickly feeling, small raised spots), eczema (dry, cracked skin often on elbows and knees), and contact dermatitis (redness from irritants or allergens). Hives present as itchy raised bumps or patches and can be triggered by foods, medications, or infections. Heat rash causes a characteristic prickly sensation and may look red on white skin or grey and white on darker skin tones.

What does a fungal rash look like?

Ringworm — the most common fungal rash — typically appears as circular, scaly patches with a clearer border, giving it a ring-shaped appearance. Unlike bacterial rashes, ringworm has a well-defined edge and is not typically associated with honey-coloured crusting. The NHS provides visual guidance on ringworm identification and treatment options including antifungal creams.

How to tell viral from bacterial rash?

Visual cues can help: bacterial rashes such as impetigo show honey-coloured crusting, typically around the mouth and nose, and are most common in children aged 2 to 5 years. Scarlet fever presents as a sandpaper-textured rash. Viral rashes are often more widespread, harder to link to a specific virus, and may accompany other symptoms like cough, runny nose, or conjunctivitis. The Royal Hospital for Children Glasgow notes that viral rashes in children are common and often difficult to pinpoint without laboratory testing.

Are there pictures of rashes on legs?

Yes — several NHS and clinical resources include leg-specific rash imagery. Eczema commonly affects the backs of the knees, while contact dermatitis may appear on any body part that has touched an irritant. Heat rash can affect the thighs and groin area. The Prevention picture guide includes examples across body locations, and the NHS 111 Wales tool allows browsing by rash type, making it possible to find leg-specific comparisons.