Systemic lupus erythematosus (SLE) is a chronic autoimmune disease affecting millions worldwide, with skin involvement occurring in about 70% to 80% of patients1 . One of the most recognizable signs of lupus is the butterfly-shaped rash, also known as the malar rash, which appears across the cheeks and the bridge of the nose2 . This rash can be a key clue in diagnosing lupus but may also occur in other conditions, making understanding its features and management essential3 .
Butterfly Rash (Malar Rash) Overview
The butterfly rash, or malar rash, is a distinctive skin manifestation that spreads across both cheeks and the nasal bridge, resembling the wings of a butterfly4 . It typically appears as a red or purplish flat or slightly raised patch and often spares the nasolabial folds—the skin folds running from the sides of the nose to the corners of the mouth5 . The rash can be itchy, painful, or cause a burning sensation, and it may remain localized or spread to other facial areas3 .
This rash is most commonly associated with lupus but can also be seen in other diseases. In lupus, the rash results from inflammation caused by the immune system mistakenly attacking healthy skin cells, often triggered or worsened by exposure to ultraviolet (UV) light6 . The malar rash is one of the American College of Rheumatology’s criteria for diagnosing systemic lupus erythematosus (SLE) 7.
Lupus vs. Rosacea Rash
Rosacea is a chronic inflammatory skin condition that can produce facial redness patterns similar to the lupus butterfly rash6 . However, there are important differences:
- Distribution: Lupus malar rash typically spares the nasolabial folds, whereas rosacea often involves these folds and may affect the chin, forehead, and eyelids8 .
- Associated Symptoms: Lupus rash is often accompanied by systemic symptoms such as joint pain, fatigue, and photosensitivity, while rosacea primarily causes facial redness, visible blood vessels (telangiectasia), and acne-like bumps without systemic involvement6 .
- Triggers: Both conditions may worsen with sun exposure, but lupus rash is more strongly linked to photosensitivity due to immune system activation6 .
Clinical evaluation and patient history are essential to differentiate between these conditions accurately8 .
“Malar rash, also called butterfly rash, is a common facial presentation in multiple disorders. It is characterized by an erythematous flat or raised rash across the bridge of the nose and cheeks, usually sparing the nasolabial folds.”
— Sara Naji Rad, Icahn School of Medicine at Mount Sinai8
Causes of Lupus Butterfly Rash
The butterfly rash in lupus is primarily caused by autoimmune inflammation of the skin6 . Lupus is an autoimmune disease where the immune system attacks healthy tissues, including the skin, joints, kidneys, and other organs9 . The rash is a form of cutaneous lupus erythematosus (CLE), which can be limited to the skin or part of systemic lupus erythematosus (SLE) 10.
Key causes and mechanisms include:
- Photosensitivity: Exposure to ultraviolet (UV) light from the sun or artificial sources triggers skin inflammation by inducing keratinocyte (skin cell) apoptosis and activating immune responses11 .
- Immune Complex Deposition: Autoantibodies form immune complexes that deposit in the skin, causing inflammation and rash development6 .
- Inflammation: The immune response leads to redness, swelling, and damage to skin tissues, resulting in the characteristic butterfly rash12 .
Cutaneous lupus can be acute, subacute, or chronic. The malar rash is a hallmark of acute cutaneous lupus erythematosus (ACLE) 6. Other lupus skin manifestations include:
- Vasculitis and petechiae due to vascular inflammation11 .
- Calcinosis cutis, or calcium deposits in the skin, though less common11 .
Other Butterfly Rash Causes
Several other conditions can cause a butterfly-shaped facial rash, making accurate diagnosis critical:
- Rosacea: Chronic inflammatory skin disease affecting the face, often with erythema, pustules, and telangiectasia6 .
- Cellulitis: Bacterial infection causing localized redness, swelling, and systemic symptoms like fever13 .
- Dermatomyositis: Autoimmune disease with a heliotrope rash and Gottron's papules, distinct from lupus rash11 .
- Erysipelas: Bacterial skin infection with sharply demarcated red lesions and systemic symptoms13 .
- Pellagra: Rare nutritional deficiency causing photosensitive dermatitis11 .
Differentiating these requires careful clinical evaluation and sometimes laboratory testing14 .
Diagnosing Lupus and the Rash
Diagnosing lupus involves a combination of clinical assessment and laboratory testing due to its varied symptoms and lack of a single definitive test11 . The presence of a butterfly rash can be an important clinical clue but is not solely diagnostic15 .
“The malar rash, also known as the butterfly rash, extends from the cheeks across the nasal bridge. About half of patients with systemic lupus erythematosus develop this rash after ultraviolet light exposure.”
— Henry J. Lee, Hospital for Special Surgery7
Key diagnostic considerations include:
- Clinical History and Physical Exam: Detailed evaluation of symptoms such as rash, joint pain, fatigue, and photosensitivity11 .
- Laboratory Tests:
- Antinuclear antibody (ANA) test is positive in over 95% of lupus patients but is not specific to lupus11 .
- More specific autoantibodies include anti-double-stranded DNA (anti-dsDNA) and anti-Smith (anti-Sm) antibodies11 .
- Blood counts may reveal anemia, leukopenia, or thrombocytopenia11 .
- Renal function tests assess for lupus nephritis11 .
- Skin Biopsy: May be performed to confirm cutaneous lupus and rule out other causes11 .
UV light exposure often triggers or worsens the butterfly rash due to photosensitivity, which is a key feature in lupus diagnosis6 . The rash typically affects sun-exposed areas such as the cheeks and nasal bridge but spares the nasolabial folds5 .
Other conditions causing butterfly rashes must be excluded through clinical and laboratory evaluation14 .
Skin conditions associated with lupus are significant and play a major role in both diagnosis and clinical course. Of the 11 criteria set by the American College of Rheumatology in 1997, four are skin-related.
— Henry J. Lee, Hospital for Special Surgery7
Treating Lupus Rash Symptoms
Treatment of lupus butterfly rash aims to reduce inflammation, control symptoms, and prevent flares6 . Therapy is tailored to disease severity and individual patient factors11 .
Common treatment options include:
- Antimalarials: Hydroxychloroquine is the mainstay for controlling lupus skin manifestations and systemic symptoms. It reduces inflammation and improves skin and joint symptoms11 .
- Corticosteroids: Used topically, orally, or by injection to reduce skin inflammation. Intralesional corticosteroid injections can target localized lesions6 11.
- Immunosuppressants: Reserved for severe or refractory skin disease to suppress the immune response6 11.
Side effects and monitoring are important considerations, especially with long-term corticosteroid or immunosuppressant use7 .
| Treatment Type | Purpose | Notes |
|---|---|---|
| Hydroxychloroquine | Reduce inflammation, control rash and joint symptoms11 | Requires regular eye exams due to rare retinal toxicity7 |
| Corticosteroids | Rapidly reduce skin inflammation6 | Topical or systemic; risk of skin thinning with topical use7 |
| Immunosuppressants | For severe or resistant cases6 | Includes drugs like methotrexate or thalidomide7 |
| Sources: 6711 | ||
Early treatment with hydroxychloroquine may delay systemic lupus onset and improve skin symptoms. Sun protection combined with medication enhances treatment effectiveness11 7.
Preventing Lupus Flare-ups
Preventing lupus skin flares focuses largely on minimizing triggers, especially UV light exposure6 . Photosensitivity is common in lupus patients, and UV light can provoke or worsen the butterfly rash11 .
Effective preventive measures include:
- Avoiding sun exposure during peak UV hours11 .
- Wearing protective clothing such as wide-brimmed hats and UV-protective fabrics6 .
- Applying broad-spectrum sunscreens with SPF 50 or higher to shield against UVA and UVB rays11 .
- Using UV-protective indoor lighting to reduce artificial UV exposure6 .
- Avoiding irritation, scratching, or trauma to existing skin lesions to prevent worsening11 .
These strategies help reduce the frequency and severity of lupus skin flares6 .
💡 Did You Know?
Lupus rashes tend to come and go or flare up unexpectedly, often triggered by sunlight or artificial UV light exposure16 .
Key Takeaways
- The lupus butterfly rash, or malar rash, is a red or purplish rash across the cheeks and nasal bridge, sparing the nasolabial folds, and is a hallmark of lupus skin involvement5 4.
- Photosensitivity to UV light is a major trigger for the rash, causing immune activation and skin inflammation6 11.
- Diagnosis of lupus involves clinical evaluation, autoantibody testing (ANA, anti-dsDNA), and sometimes skin biopsy11 .
- Treatment includes antimalarials like hydroxychloroquine, corticosteroids, and immunosuppressants depending on severity6 11.
- Preventive measures such as sun avoidance, protective clothing, and high-SPF sunscreen are essential to reduce lupus skin flares6 11.
