Lupus Erythematosus Panniculitis: An Insight

What Is Lupus Erythematosus Panniculitis?

Lupus erythematosus panniculitis (LEP) is a rare autoimmune disorder. It is yet another clinical variant of lupus and is said to affect the panniculus. Panniculus refers to the subcutaneous layer of fat that is present just below the skin. This atypical disease is characterized by the development of small, erythematous nodules (red to purple nodules) over the skin, particularly involving the face, breast, thighs, and buttocks.

LEP is generally found to occur alongside a co-existing disease such as discoid lupus erythematosus (an autoimmune skin condition characterized by red plaques on the face, ears, and scalp) or systemic lupus erythematosus (an autoimmune disease affecting the skin, joints, kidneys, and brain). However, its incidence may also be reported in an isolated manner.

What Are the Symptoms of Lupus Erythematosus Panniculitis?

The characteristic hallmark of lupus erythematosus panniculitis is the formation of painful, tender nodules under the skin. These nodules are about 0.39 to 1.97 inches in dimension and do not resolve in a short time.

Lupus panniculitis nodules can develop almost anywhere on the body, though they most commonly appear on the face, neck, shoulders, arms, back, breasts, abdomen, thighs, and buttocks.

These nodules typically feel sensitive to the touch, sometimes hard, and are usually found beneath the skin or are persistently itchy. They tend to appear suddenly and resolve within days to weeks. But recurrence is very common, as lupus panniculitis follows a relapsing pattern known as flares or episodes.

When nodules repeatedly form in the same area, they can cause lasting skin changes. Repeated damage to the underlying fat tissue may lead to fat breakdown, leaving the skin looking deflated, indented, or less firm than the surrounding area, a condition referred to as pitting or lipoatrophy.

What Causes Lupus Erythematosus Panniculitis?

Lupus is categorized as an autoimmune disease. The exact cause of lupus and its variants is not certain to date.

Autoimmune diseases are recognized as conditions triggered by one’s immune system itself. The body has a defense system that is capable of warding off any foreign invasion or harmful organisms like bacteria and viruses. However, in some select cases, the immune system is highly activated, resulting in an abnormal immune response. In panniculitis disease, the healthy tissue of the fat layer present below the skin is targeted, which leads to inflammation of the panniculus. Over time, symptoms are noticeable.

Certain factors that may trigger the disease include:

• Genetics.

• Exposure to UV (ultraviolet) rays.

• Side effects of certain medications.

• Smoking.

• Acute infections (bacterial or viral).

Who Is Affected by Lupus Erythematosus Panniculitis?

Anyone can acquire this disease. However, middle-aged women are most prone to suffer from its incidence. Women tend to show a higher rate of occurrence owing to their highly active immune system during childbearing age.

How Is Lupus Erythematosus Panniculitis Diagnosed?

This lupus variant may pose a challenge to make an accurate diagnosis owing to the resemblance of its symptoms to other variants and conditions like T-cell lymphomas (an aggressive form of blood cancer arising from T-lymphocyte). Diagnosing LEP usually takes a few steps. To get a clearer picture, the doctor may recommend the following tests

• Biopsy: To check for signs of inflammation or tissue damage.

• Blood Tests: To assess how well your immune system is functioning.

• Urinalysis: May also be done to detect any abnormalities in your urine.

• ANA Test: Helps identify specific antibodies that may point toward an autoimmune cause.

How to Treat Lupus Erythematosus Panniculitis?

Lupus erythematosus panniculitis, once diagnosed, must receive immediate treatment. Its purpose is to decrease inflammation and scarring.

• Sun Protection: Sun exposure can trigger and worsen lupus panniculitis. So daily use of a broad-spectrum sunscreen with at least SPF (sun protection factor) 30 is essential.

• Smoking Cessation: Smoking has been linked to more severe disease and can reduce how well antimalarial medications work.

• Topical Therapy: Topical steroids or calcineurin inhibitors, especially on sensitive areas like the face. It can help manage surface-level symptoms.

• Antimalarials (Hydroxychloroquine): Hydroxychloroquine is the first-line treatment for LEP and works by calming the overactive immune response. It typically takes two to three months to show improvement. Regular eye check-ups are needed since long-term use can rarely affect vision.

• Thalidomide: When antimalarials are not enough, Thalidomide can be added as a second-line option and often shows results within two to three weeks. However, it carries serious risks, including nerve damage and birth defects, so it requires strict medical supervision.

• Dapsone: Dapsone can be used alongside antimalarials in stubborn cases. Blood tests are monitored regularly as it can affect red blood cells and liver function.

• Steroids: Prednisolone is commonly used short-term for severe flares while waiting for other medications to take effect, but it is not meant for long-term use. It is always combined with other treatments.

• Methotrexate: Methotrexate is a weekly medication that shows results within three to four weeks. Regular liver and blood monitoring is needed, and alcohol must be completely avoided.

• Mycophenolate Mofetil (MMF): MMF is a well-tolerated immunosuppressant that works gradually over about four weeks and is effective for both skin and systemic lupus. Digestive side effects like nausea usually improve by starting at a lower dose.

• Azathioprine: Azathioprine reduces the need for long-term steroids and takes around four to eight weeks to show results. Regular blood monitoring is required throughout treatment.

• Cyclosporine: In cases of severe or extensive LEP, Cyclosporine effectively reduces scarring. Before switching to a safer long-term solution, it is usually taken temporarily for three to six months.

• Intravenous Immunoglobulin (IVIG): Intravenous immunoglobulin (IVIG) is utilized when alternative therapies are ineffective for severe cases. Within two to three weeks, there is a discernible improvement. Because of its high cost and potential for severe adverse effects, it is taken with caution.

Conclusion

Lupus erythematosus panniculitis is a rare autoimmune condition that affects the fat under the skin. It causes scarring, painful nodules, and changes in the skin, leading to disfigurement over time. It often coexists with other forms of lupus, such as systemic lupus erythematosus (SLE) or discoid lupus erythematosus (DLE). Sometimes it can occur alone. Simple measures like quitting smoking and protecting oneself from the sun are part of the treatment, and depending on the patient's reaction, antimalarial medications and other medications are administered next. Always consult a skin specialist to find the right treatment approach for you.

Key Takeaways

• Lupus panniculitis is a rare autoimmune condition where the immune system targets the fat cells beneath the skin. It causes painful nodules most commonly seen on the face, arms, thighs, and buttocks.

• Hydroxychloroquine is the first-line treatment for LEP, though the approach is tailored based on disease severity and individual response.

• Quitting smoking and using sunscreen with an SPF (sun protection factor) of 30 every day helps reduce flare-ups and enhance treatment results.

• Preventing scarring and deformity requires early diagnosis and consistent medical monitoring.