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What Is Erythema Nodosum?

Erythema Nodosum is an inflammatory condition that causes tender, red, and warm lumps, or nodules, to develop just under the skin. These painful lumps are most commonly found on the shins, but they can also appear on the thighs, arms, or other areas. It is an inflammation of the layer of fat beneath the skin (panniculitis). Erythema Nodosum is not a disease in itself, but rather a common reaction pattern that signals an underlying infection, illness, or systemic inflammatory condition in the body.

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What Is Erythema Nodosum?

Erythema Nodosum is an inflammatory condition that causes tender, red, and warm lumps, or nodules, to develop just under the skin. These painful lumps are most commonly found on the shins, but they can also appear on the thighs, arms, or other areas. It is an inflammation of the layer of fat beneath the skin (panniculitis). Erythema Nodosum is not a disease in itself, but rather a common reaction pattern that signals an underlying infection, illness, or systemic inflammatory condition in the body.

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Common Triggers and Underlying Conditions

In about a third of cases, the cause of Erythema Nodosum is never found. However, when a cause is identified, it is often one of the following:

  • Infections: Strep throat (streptococcal infection) is the most common trigger, especially in children. Other infections include tuberculosis and fungal diseases.
  • Systemic Diseases: Inflammatory bowel diseases (like Crohn's disease or ulcerative colitis) or sarcoidosis are frequent triggers.
  • Medications: Certain drugs, including oral contraceptives and some antibiotics, can cause the reaction.

Symptoms and Duration

Before the painful nodules appear, a person may experience flu-like symptoms, including fever, joint aches, and fatigue. Once the nodules appear, they are firm, warm to the touch, and can be quite tender. They usually last for a few weeks, changing color from bright red to a purplish bruise-like color as they heal, and they typically do not leave a scar.

The Important Eye Health Connection

Because Erythema Nodosum is often linked to systemic inflammatory diseases like sarcoidosis, it is crucial to monitor overall health. Sarcoidosis commonly affects the lungs, lymph nodes, and skin, but it can also involve the eyes, causing inflammation of the uvea (the middle layer of the eye). Ocular sarcoidosis (uveitis) can lead to eye pain, redness, blurred vision, and light sensitivity.

Lens.com: Seeing the Link Between Body and Eye

At Lens.com, we emphasize that your vision health is part of your whole-body health. If you are diagnosed with an underlying condition that causes inflammation, like those linked to Erythema Nodosum, it is vital to have regular, detailed eye exams. Early detection of conditions such as uveitis plays a major role in protecting your long-term vision.

Frequently Asked Questions About Erythema Nodosum

Is Erythema Nodosum contagious?

No. Erythema Nodosum is an inflammatory reaction within the body and is not caused by a superficial infection, so you cannot catch it from another person.

How is Erythema Nodosum treated?

Treatment focuses on addressing the underlying cause (e.g., treating a strep infection) and managing pain and inflammation with rest, elevation, compression, and non-steroidal anti-inflammatory drugs (NSAIDs).

Do the lumps leave scars?

No. Because the inflammation is limited to the fat layer beneath the skin and does not cause ulceration or tissue loss on the surface, the lumps typically fade away like a deep bruise without leaving a permanent scar.