Health condition
Erythema nodosum: causes and workup
Erythema nodosum produces tender red-purple lumps on the shins and is a reaction pattern rather than a disease - the important question is what triggered it, from streptococcal infection to sarcoidosis, inflammatory bowel disease or medication.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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Tender, warm, deep nodules on both shins that bruise as they fade over three to six weeks
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It is a panniculitis - inflammation of the fat layer - and usually settles without scarring
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Common triggers: streptococcal throat infection, sarcoidosis, pregnancy, the oral contraceptive pill, and inflammatory bowel disease
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A chest X-ray, throat swab or ASO titre and basic bloods are standard first-line investigations
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
The nodules of erythema nodosum sit deep under the skin, feel bruise-like and are often accompanied by ankle swelling, low-grade fever and joint aches. Because it represents a hypersensitivity reaction in the subcutaneous fat, the rash itself is rarely dangerous - the significance lies in what set it off.
Diagnosis and treatment routes
Assessment focuses on the trigger: a careful drug history, throat swab and streptococcal serology, chest X-ray to look for the hilar lymph node enlargement of sarcoidosis, and bowel symptoms review; a deep skin biopsy is reserved for atypical or persistent cases. Treatment is rest, leg elevation, ibuprofen or naproxen, and management of the underlying cause - most episodes resolve fully within six weeks. In much of the UK, a routine NHS referral to the relevant specialist clinic can take several months, whereas an initial appointment with a private consultant is typically available within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a consultant dermatologist. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about Erythema nodosum: causes and workup.
Quick, plain-English answers to what people ask us most.
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Can you explain what erythema nodosum: causes and workup is?
Erythema nodosum: causes and workup refers to a recognised clinical condition that a GP or specialist assesses using your history, examination and, if appropriate, targeted investigations. The way it presents and its impact can vary considerably from person to person.
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What causes erythema nodosum: causes and workup?
The exact cause of erythema nodosum: causes and workup can involve a mix of genetic, environmental and lifestyle factors, and it isn't always possible to pin down a single trigger. A specialist assessment can help identify any modifiable risk factors relevant to you.
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What does erythema nodosum: causes and workup look like?
Symptoms of erythema nodosum: causes and workup vary from person to person and can range from mild and easily missed to significant enough to affect daily life. Because overlapping conditions can produce similar symptoms, a clinical assessment is the most reliable way to confirm what's actually going on.
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Is erythema nodosum: causes and workup serious or dangerous?
Most cases of erythema nodosum: causes and workup are manageable with appropriate care, though, like many conditions, it can occasionally lead to complications if left unassessed or untreated. Your clinician can give you a realistic sense of the risks based on your specific presentation.
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Does erythema nodosum: causes and workup run in families?
In most cases erythema nodosum: causes and workup isn't straightforwardly inherited, though family history can sometimes be a relevant background factor. A clinician can help you understand whether it's worth mentioning relatives' health when being assessed.
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Can erythema nodosum: causes and workup be treated or prevented?
Erythema nodosum: causes and workup can often be managed effectively, and in some cases prevented or reversed, with the right combination of lifestyle changes, medication or other targeted treatment. A specialist will tailor the approach to your circumstances rather than applying a one-size-fits-all plan.
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What treatment options are available for erythema nodosum: causes and workup?
Management of erythema nodosum: causes and workup is individualised, ranging from conservative measures and monitoring through to more active medical or surgical treatment depending on how it's affecting you. A clear diagnosis is the first step towards choosing the right approach.
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How long does erythema nodosum: causes and workup last?
The outlook for erythema nodosum: causes and workup varies widely depending on the underlying cause, how early it's diagnosed, and how it responds to treatment. Many people see significant improvement with appropriate care, and your specialist can give you a more personalised timeframe once they've reviewed your case.
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What else could erythema nodosum: causes and workup be mistaken for?
Because several conditions can share similar symptoms to erythema nodosum: causes and workup, clinicians often consider a short list of possibilities before confirming a diagnosis. This is one of the main reasons a proper assessment, and sometimes targeted tests, matters more than relying on symptoms alone.
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When should I see a doctor about erythema nodosum: causes and workup, and how quickly can I be seen privately?
It's worth seeking medical advice if symptoms of erythema nodosum: causes and workup are persistent, worsening, or affecting your daily life, rather than waiting for them to resolve on their own. NHS routine referrals for this kind of assessment can take anywhere from around 20 to 45+ weeks, whereas private consultants typically offer an appointment within about two weeks.