Erythema Nodosum

What is Erythema Nodosum?

Erythema nodosum is an acute inflammation of the fat layer under the skin (a nodular panniculitis) that produces firm, tender red lumps, mostly on the front of the lower legs.^[1] It is the most common form of panniculitis. The exact cause is not known, but it appears to be a hypersensitivity reaction to a wide range of triggers.^[2]

Because it can be the first sign of a systemic illness, it should always be assessed by a physician. For a condition like this, we ask that you are under a physician's care for it and that your treating team knows you are receiving complementary care.

Common symptoms

The lumps are painful, rounded or oval, slightly raised and red, and usually appear on the shins and extensor surfaces of the legs without breaking the skin. They are often preceded by one to three weeks of fever, tiredness or a cold-like illness, and may come with joint pain.^{[3, 4]}

• Tender, warm red or purple lumps, often several at once
• Fever and a general unwell feeling
• Aching in the ankles, knees or other joints

Causes and risk factors

Up to about half of cases have no cause found, but when one is identified the common ones include infections, medicines, sarcoidosis, inflammatory bowel disease, Behçet disease, pregnancy and, less often, cancer.^{[2, 3]} Strep throat and primary tuberculosis are among the most common infectious triggers.^[2] It is more common in women, and usually begins in the teens and 20s.^{[3, 4]}

Erythema nodosum is part of Löfgren syndrome, a form of sarcoidosis that also causes swollen lymph nodes in the chest and ankle inflammation, and it often occurs with flares of inflammatory bowel disease.^{[5, 6]}

How it is diagnosed and treated conventionally

Diagnosis rests on the typical appearance and a search for the trigger, usually with a history, examination and tests chosen by your doctor. Ruling out an underlying disease is considered essential before calling it primary erythema nodosum.^[2] Because erythema nodosum can occasionally accompany a cancer, doctors stay alert to this during diagnosis.^[4]

Treatment is aimed at the cause. Treatments for the skin lesions themselves ease symptoms but do not treat the trigger.^[2] The lumps typically resolve without specific treatment, so symptom relief is adequate for most people.^[3] In inflammatory bowel disease, mild disease is managed with leg elevation, compression stockings, pain relievers and anti-inflammatory medicine, and it improves when the bowel disease is treated.^[6] Your physician decides on any other treatment.

Why Erythema Nodosum calls for a whole-person approach

Erythema nodosum is a skin sign of something happening elsewhere in the body, so the skin alone is not the whole story. Looking for the trigger is the first job, and your physician leads that.

While that work happens, there are practical areas where supportive care may help.

Pain and comfort

The lumps are tender, and joint aching can make walking and standing uncomfortable.^[4] Acupuncture has been studied for chronic pain, as described below.^[7]

Inflammation

The nodules are an inflammatory process in the fat under the skin.^[3] Some studies have looked at whether turmeric lowers general inflammation markers, but not in erythema nodosum.^[8]

The underlying trigger

Infections, bowel disease, sarcoidosis and medicines are all possible drivers, and each has its own treatment.^[2] This is why we ask for your diagnosis and test results.

Rest and recovery

For mild erythema nodosum linked to inflammatory bowel disease, leg elevation is among the standard measures.^[6] Stress and poor sleep can make coping harder, though we found no research linking them specifically to erythema nodosum.

Acupuncture as supportive care in Erythema Nodosum

What the research shows

No clinical trials of acupuncture for erythema nodosum were found, so we cannot say it shortens the episode or treats the cause. The evidence that exists is for pain in other conditions.

An individual patient data meta-analysis of 39 trials with about 20,800 patients found acupuncture reduced chronic musculoskeletal pain, osteoarthritis pain, headache and shoulder pain more than sham or no acupuncture, with effects lasting over a year.^[7] These were not skin or panniculitis conditions, and the result may not apply to erythema nodosum.

How acupuncture may work

We know of no research on how acupuncture would act in erythema nodosum, and we do not claim that it influences the immune reaction behind it.

What treatment involves

Treatment uses fine, sterile, single-use needles placed at selected points, usually left in for about 20 to 40 minutes, over a short course of visits with reassessment. Needles are not placed through the tender nodules or inflamed skin, and points away from the legs, such as on the hands, arms or back, may be used instead.

Serious problems are rare. In prospective studies, about 9 in 100 patients had a minor reaction such as brief bleeding, soreness or redness at a needle site, and serious events occurred in about 1 in 10,000 patients.^[9] Tell the practitioner first if you have a fever, a bleeding disorder, take blood thinners, are pregnant, or have a pacemaker (relevant to electroacupuncture).

Ayurvedic medicine as supportive care in Erythema Nodosum

The Ayurvedic view

Ayurveda has no exact counterpart to erythema nodosum. Practitioners may describe tender red, warm lumps as a Pitta and rakta (blood tissue) imbalance. These are traditional categories, not diagnoses.

Therapies that may be used

Supportive options include a cooling, simple diet, regular meals, a steady daily routine, restful sleep and gentle relaxation practices. Leg elevation matches standard medical advice. Individually prescribed herbs may be used with caution because they can interact with medicines.^[10]

Panchakarma, the traditional cleansing program, is not appropriate during pregnancy, acute illness or frailty. It is also not suited to times of fever, active lumps or an undiagnosed cause. Oil massage should be avoided over tender nodules. An herbal preparation applied to the skin (transdermal medication therapy) should not be used on inflamed or broken skin.

What the research shows

We found no clinical trials of Ayurvedic treatment for erythema nodosum, so there is no evidence that it helps.

Product quality is a concern. In one study, about one fifth of Ayurvedic medicines bought online contained detectable lead, mercury or arsenic.^[11]

Herbal medicine as supportive care in Erythema Nodosum

Herbs and formulas that have been studied

No clinical trials of herbal medicine for erythema nodosum were found. In Chinese medicine, tender red lumps on the legs are often treated with herbs that clear heat and invigorate blood, and practitioners choose formulas by pattern. Turmeric (curcumin) is a commonly studied anti-inflammatory herb, though not in this condition.

What the research shows

A meta-analysis of 66 randomized trials found that turmeric or curcumin supplements lowered blood markers of inflammation such as CRP, TNF-alpha and IL-6 in adults, but these were mostly measures in the blood and in other conditions.^[8] In arthritis, a meta-analysis of 8 trials found that turmeric extract lowered pain scores compared with placebo in the three trials that reported them, but the authors said the number, sample size and quality of trials were not enough for definitive conclusions.^[12] Neither finding shows that turmeric helps erythema nodosum.

Safety and herb-drug interactions

Herbs can interact with medicines. A review describes bleeding when warfarin is combined with danshen, ginkgo or garlic, and lowered ciclosporin levels with St. John's wort, which led to organ rejection in some cases.^[10] If erythema nodosum is linked to inflammatory bowel disease, sarcoidosis or another illness, you may take steroids or immune-suppressing drugs, so each herb must be reviewed against your medicine list.

Herbal and dietary supplements are also a recognized cause of liver injury.^[13] Tell us if you are pregnant or breastfeeding, have liver or kidney disease, or have surgery planned. Herbs should come from tested sources and are prescribed individually.

Translating traditional medicine into modern biological language

This section is interpretation, not equivalence. Chinese medicine may describe red, hot, tender lumps as damp-heat or blood stasis in the lower limbs. Ayurveda would refer to Pitta and rakta. The closest modern idea is inflammation of the septa of the fat layer, thought to follow a hypersensitivity reaction.^[3]

No study has shown that a qi pattern or dosha corresponds to that immune process, and these traditional terms should not be used to choose between medical tests.

How this care fits with your medical care

Supportive care here is complementary. Keep seeing your physician until the cause has been looked for, and continue any prescribed treatment for an underlying condition. Do not stop or change prescribed medicines without your prescriber. We do not diagnose the cause of erythema nodosum, and we do not prescribe or adjust drugs.

Please bring your diagnosis, results of any tests such as a throat swab, chest X-ray or blood work, a list of all medicines and supplements, and any notes about bowel, lung or joint symptoms.

When to seek urgent medical care

Most erythema nodosum settles on its own, but some symptoms point to an infection or a serious underlying illness.

• Lumps that open, ooze, or form ulcers, or skin that becomes spreading red, hot and swollen
• High fever, shaking chills or feeling very ill
• Cough with shortness of breath, chest pain, or coughing blood
• Severe or bloody diarrhea, or severe abdominal pain
• Unexplained weight loss, drenching night sweats, or lumps that keep returning
• A swollen, painful calf, which can signal a blood clot rather than erythema nodosum

If you have any of these, call 911 or go to the nearest emergency department.