Erythema Nodosum - Symptoms, Causes & Treatment
By ScanSkinAI Editorial Team✓ Reviewed for medical safetyLast updated June 2026
A type of skin inflammation characterized by tender, red nodules on the shins. It's often a reaction to infection, medication, or underlying disease.
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Quick Answer
Erythema nodosum is an inflammatory skin condition that causes painful, warm, red lumps to form, typically on the front of your lower legs. Rather than being a disease itself, it is usually a reaction to an underlying trigger, such as a streptococcal infection, certain medications, pregnancy, or an inflammatory disease like sarcoidosis or inflammatory bowel disease. While the lumps can be quite tender and may be accompanied by fever or joint pain, they usually heal like bruises over a few weeks without leaving scars once the underlying cause is addressed.
Symptoms
- Tender, red nodules on shins
- Warm to touch
- May have fever and joint pain
- Nodules don't ulcerate
- Bruise-like color changes as they heal
Causes & Risk Factors
- Streptococcal infection
- Sarcoidosis
- Inflammatory bowel disease
- Medications
- Pregnancy
- Often idiopathic
Treatment & Management
- Treat underlying cause
- NSAIDs for pain
- Rest and leg elevation
- Potassium iodide
- Compression stockings
- Usually resolves in weeks
When to See a Doctor
If you develop tender nodules on your shins, especially with other symptoms
Frequently Asked Questions
What do the lumps from erythema nodosum look and feel like?
The lumps are typically firm, red, and very tender to the touch, and they almost always appear on your shins. They feel warm and can range in size from a coin to a golf ball. Unlike some other skin sores, they do not break open or ulcerate. As they begin to heal over a few weeks, they gradually flatten and change colour, looking very much like fading bruises.
Why did I get these painful bumps on my legs?
Erythema nodosum is a reactive condition, meaning your immune system is responding to a trigger elsewhere in your body. Common triggers include throat infections like strep, certain medications, pregnancy, or underlying conditions such as inflammatory bowel disease and sarcoidosis. In many cases, however, a specific cause is never found, which doctors refer to as idiopathic. Finding the trigger usually involves a medical evaluation.
How do you treat erythema nodosum?
The most important step is identifying and treating the underlying cause, such as taking antibiotics for a strep infection. To manage the painful leg lumps, doctors often recommend resting, elevating your legs, and using non-steroidal anti-inflammatory drugs (NSAIDs) for pain relief. In some cases, potassium iodide or compression stockings might be suggested. Most episodes resolve on their own within a few weeks once properly managed.
Is erythema nodosum contagious?
No, erythema nodosum itself is completely non-contagious. You cannot catch these skin nodules by touching someone who has them. However, the underlying infection that may have triggered the condition, such as a streptococcal throat infection, can be passed from person to person. Therefore, while you cannot spread the leg bumps, you should practice good hygiene if you are fighting an active transmissible infection.
Will these bumps leave permanent scars?
One of the reassuring aspects of erythema nodosum is that the nodules typically do not leave permanent scars. As the inflammation settles down over a period of weeks, the lumps will flatten and slowly fade. During this healing phase, the affected skin will usually go through colour changes similar to a deep bruise, turning slightly purple, blue, and yellowish before fully disappearing.
When should I see a doctor for lumps on my shins?
You should have a doctor evaluate any new, tender lumps developing on your lower legs, particularly if they are warm, red, or highly painful. It is especially important to seek medical care if you also experience a fever, a recent sore throat, fatigue, or severe joint pain. A doctor can help determine if the lumps are a reaction to an underlying infection or disease that requires separate treatment.
How is this different from bug bites or typical rashes?
Unlike common bug bites or surface-level rashes that might itch or blister, erythema nodosum forms deeper under the skin, creating firm, highly painful nodules that do not break open or weep. Bug bites usually appear randomly or in small clusters, whereas these nodules are distinctly concentrated on the front of the lower legs. If your skin lumps feel like deep bruises rather than itchy surface spots, a medical check is recommended.
How can ScanSkinAI help if I suspect I have erythema nodosum?
ScanSkinAI acts as an early screening aid to help you evaluate skin changes from home. By analysing images of the painful lumps on your shins, the AI can suggest whether they visually align with features of erythema nodosum. However, ScanSkinAI cannot provide a medical diagnosis or find the underlying cause. You must always consult a healthcare professional for a definitive diagnosis and an appropriate treatment plan.
Medical References
Information on this page is sourced from and verified against reputable medical resources:
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Medical Disclaimer: This information is for educational purposes only and is not intended as medical advice. The content on this page should not be used to diagnose or treat any health problem. Always consult with a qualified healthcare professional for proper medical evaluation, diagnosis, and treatment of your condition.