Rheumatoid Nodules

Rheumatoid nodules are firm, painless lumps that form under the skin, most often in people who have rheumatoid arthritis (RA). These nodules are a common symptom of RA, typically appearing near joints like the elbows, fingers, or heels. While usually harmless, they can sometimes cause discomfort or complications.

What is Rheumatoid Nodules?

Rheumatoid nodules are firm, round or oval-shaped lumps that develop under the skin, primarily affecting individuals with rheumatoid arthritis (RA). They are a common feature of RA, often appearing in areas subject to pressure, such as the elbows, forearms, fingers, and heels. These nodules are generally painless, but their size and location can vary.

Rheumatoid nodules are essentially collections of inflammatory cells and tissue that form beneath the skin. They can range in size from as small as a pea to as large as a walnut, or even bigger in some cases. While they are most commonly found on the extensor surfaces of joints (the parts that straighten), they can also appear in other areas. These nodules are a specific type of extra-articular manifestation, meaning they occur outside of the joints, even though they are linked to joint-affecting rheumatoid arthritis. They are not cancerous and do not typically spread. Their presence often indicates more severe or long-standing rheumatoid arthritis. In some instances, rheumatoid nodules can form in internal organs, such as the lungs, heart, or vocal cords. However, this is less common than their appearance under the skin. When they occur internally, they usually do not cause symptoms unless they grow large enough to interfere with organ function. About 1 in 5 people (20%) with rheumatoid arthritis will develop rheumatoid nodules. They are more common in people who have a positive test for rheumatoid factor (RF) or anti-cyclic citrullinated peptide (anti-CCP) antibodies, which are markers often associated with RA.

Symptoms

Rheumatoid nodules typically present as firm, non-tender lumps under the skin, with their primary symptom being their physical presence. They usually do not cause pain unless they are located in an area that experiences frequent pressure or friction, or if they become infected. Their size and number can vary greatly among individuals.

The most common symptom of rheumatoid nodules is the appearance of noticeable lumps. These lumps are usually firm to the touch and feel rubbery or hard. They are generally mobile under the skin but are attached to deeper tissues. While most rheumatoid nodules are painless, they can become tender or painful if they are in a location that is constantly bumped or rubbed, such as on the elbow or heel. Pressure from shoes or clothing can also irritate them. In rare cases, the skin over a nodule may break down, leading to an open sore or ulcer that can become infected. Nodules can appear as single lumps or in clusters. Their size can fluctuate over time, sometimes growing larger or shrinking, and in some cases, they may even disappear completely without treatment. However, new nodules can also form in different locations. When rheumatoid nodules occur in internal organs, they typically do not cause symptoms unless they grow large enough to affect the organ's function. For example, lung nodules might cause a cough or shortness of breath, but this is uncommon.

Causes & risk factors

Rheumatoid nodules are a direct complication of rheumatoid arthritis (RA), an autoimmune disease where the body's immune system mistakenly attacks its own tissues. The exact reason why some people with RA develop nodules and others do not is not fully understood, but certain factors increase the risk.

The primary cause of rheumatoid nodules is the underlying inflammatory process of rheumatoid arthritis. In RA, chronic inflammation leads to the formation of these characteristic lumps. It is believed that repeated pressure or trauma to an area may also contribute to their development in susceptible individuals. Several risk factors are associated with the development of rheumatoid nodules. One significant factor is having severe or long-standing rheumatoid arthritis. People with more aggressive forms of RA are more likely to develop nodules. Another key risk factor is testing positive for rheumatoid factor (RF) and anti-cyclic citrullinated peptide (anti-CCP) antibodies in blood tests. These antibodies are indicators of RA activity and are often present in people who develop nodules. Smoking is also considered a risk factor, as it can worsen RA and increase the likelihood of developing nodules. Certain medications used to treat RA, particularly methotrexate, have been linked to the development of new or worsening nodules in some patients, though this is rare. This phenomenon is sometimes called "accelerated nodulosis." However, the benefits of these medications for RA often outweigh this potential risk, and your doctor will weigh these factors.

How it's diagnosed

Rheumatoid nodules are typically diagnosed through a physical examination by a doctor, who will assess the appearance and feel of the lumps. If there is any uncertainty about the diagnosis, especially to rule out other conditions, a biopsy may be performed to examine a small tissue sample under a microscope.

During a physical exam, your doctor will look for the characteristic firm, non-tender lumps under your skin, often in typical locations like the elbows or fingers. They will also consider your medical history, particularly if you have a diagnosis of rheumatoid arthritis or symptoms consistent with it. Blood tests, while not directly diagnosing nodules, can support the diagnosis by confirming rheumatoid arthritis. These tests often include checking for rheumatoid factor (RF) and anti-cyclic citrullinated peptide (anti-CCP) antibodies, which are frequently positive in people with rheumatoid nodules. In cases where the diagnosis is unclear, or if there's concern about other conditions like gouty tophi or certain skin cancers, a biopsy may be recommended. This procedure involves removing a small piece of the nodule tissue, which is then sent to a lab for microscopic examination. The biopsy can confirm the presence of inflammatory cells characteristic of rheumatoid nodules. Imaging tests, such as X-rays, ultrasound, or MRI, are generally not needed to diagnose skin nodules. However, if nodules are suspected in internal organs, imaging might be used to locate and assess them. For example, a chest X-ray or CT scan might detect lung nodules.

Treatment options

Treatment for rheumatoid nodules often focuses on managing the underlying rheumatoid arthritis (RA) with medications, as this can help reduce the size or prevent the formation of new nodules. For bothersome or complicated nodules, local treatments like steroid injections or surgical removal may be considered, though nodules can sometimes return.

Since rheumatoid nodules are a manifestation of RA, the most effective treatment is often to optimize the management of your rheumatoid arthritis. Medications that control RA inflammation, such as disease-modifying antirheumatic drugs (DMARDs) and biologic agents, can sometimes cause existing nodules to shrink or prevent new ones from forming. If a nodule is causing pain, is infected, or is in a location that interferes with daily activities, your doctor might suggest local treatments. Steroid injections directly into the nodule can sometimes help reduce its size and inflammation. However, this is not a permanent solution, and the nodule may return or not respond. Surgical removal of a nodule is an option, especially if it is large, painful, infected, or causing functional problems. However, surgery carries risks, including infection and potential for the nodule to recur at the same site or nearby. Doctors usually reserve surgery for cases where other treatments have failed or when the nodule causes significant issues. It's important to discuss all treatment options with your doctor. They can help you weigh the benefits and risks based on the specific characteristics of your nodules and your overall RA management plan. Sometimes, no specific treatment is needed if the nodules are small, painless, and not causing any problems.

Recovery & outlook

The outlook for rheumatoid nodules is generally good, as they are usually harmless and often do not require specific treatment beyond managing the underlying rheumatoid arthritis (RA). While some nodules may shrink or disappear, others can persist or recur, and complications like infection or skin breakdown are possible but uncommon.

Most rheumatoid nodules are benign and do not cause serious health problems. For many people, effectively treating their rheumatoid arthritis with medications can lead to a reduction in nodule size or even their complete disappearance. However, some nodules may remain unchanged or even grow despite RA treatment. Recovery from surgical removal of a nodule typically involves a healing period, and there is a chance that the nodule could recur in the same area. It is important to follow post-operative care instructions to minimize complications like infection. Potential complications of rheumatoid nodules, though rare, include skin breakdown over the nodule, leading to ulcers that can become infected. If nodules occur in internal organs, they can sometimes cause symptoms related to that organ's function, but this is less common and often managed by treating the underlying RA. Living with rheumatoid nodules often involves monitoring them for changes in size, pain, or signs of infection. Regular communication with your rheumatologist about your nodules and your overall RA management is key to maintaining a good quality of life.

When to see a doctor

You should see your doctor if you notice any new lumps under your skin, especially if you have rheumatoid arthritis, to confirm they are rheumatoid nodules and rule out other conditions. It is particularly important to seek medical attention if a nodule becomes painful, red, warm, or shows signs of infection, or if it grows rapidly.

If you have rheumatoid arthritis and develop new lumps, it's always best to have them checked by your doctor. While they are likely rheumatoid nodules, a medical professional can confirm the diagnosis and ensure they are not something else that requires different treatment. Seek immediate medical attention if a rheumatoid nodule becomes painful, tender, red, or warm to the touch. These could be signs of an infection, which may require antibiotics or other interventions. Also, if the skin over a nodule breaks open or starts to drain fluid, you should see your doctor promptly. Rapid growth of a nodule or changes in its appearance should also prompt a visit to your doctor. While rheumatoid nodules are typically benign, any unusual changes warrant evaluation to ensure there are no other underlying issues. If you experience symptoms that suggest internal nodules, such as persistent cough, shortness of breath, or chest pain, especially if you have RA, you should consult your doctor. While rare, internal nodules can sometimes affect organ function and require investigation.

Frequently asked questions

Are rheumatoid nodules cancerous?

No, rheumatoid nodules are not cancerous. They are benign (non-cancerous) growths made of inflammatory tissue and are a common manifestation of rheumatoid arthritis. They do not spread to other parts of the body like cancer cells do.

Can rheumatoid nodules go away on their own?

Yes, rheumatoid nodules can sometimes shrink or disappear on their own, especially with effective treatment of the underlying rheumatoid arthritis. However, they can also persist for a long time or reappear in the same or different locations.

Do rheumatoid nodules always mean I have severe rheumatoid arthritis?

Not always, but rheumatoid nodules are often associated with more severe or long-standing rheumatoid arthritis. They are also more common in people who test positive for certain antibodies like rheumatoid factor (RF) and anti-CCP, which can indicate more active disease.

Can rheumatoid nodules be prevented?

While there's no guaranteed way to prevent rheumatoid nodules, effectively managing your rheumatoid arthritis with prescribed medications can help reduce the inflammation that contributes to their formation. Quitting smoking may also lower your risk, as smoking is a known risk factor for worsening RA and nodule development.

Is surgery always necessary for rheumatoid nodules?

No, surgery is not always necessary. Most rheumatoid nodules do not require surgical removal, especially if they are small, painless, and not causing any functional problems. Surgery is typically considered only for nodules that are large, painful, infected, or interfere significantly with daily activities.

What is the difference between rheumatoid nodules and gouty tophi?

Rheumatoid nodules are firm lumps associated with rheumatoid arthritis, made of inflammatory tissue. Gouty tophi, on the other hand, are deposits of uric acid crystals that form under the skin in people with chronic gout. While both can appear as lumps, they are caused by different conditions and have different compositions.

Sources

• MedlinePlus — Rheumatoid Nodules
• Mayo Clinic — Rheumatoid Nodules
• Cochrane Library — Rheumatoid Nodules