A butterfly rash is a red or purplish rash that spreads across both cheeks and the bridge of the nose, forming a shape that resembles a butterfly’s open wings. It’s most commonly associated with systemic lupus erythematosus (SLE), an autoimmune disease, though other conditions can cause a similar-looking rash. The medical name is a malar rash, referring to the malar (cheekbone) area of the face.
What It Looks Like
The rash typically appears as a flat or slightly raised patch of reddened skin stretching symmetrically across both cheeks. It connects over the bridge of the nose, completing the butterfly shape. One of its defining features is that it spares the nasolabial folds, the creases running from each side of the nose to the corners of the mouth. The skin in those folds stays clear even as the surrounding area flushes red.
The outer edges of a lupus butterfly rash often have a noticeably raised border, which can help distinguish it from other facial rashes. The skin in the affected area may feel warm, slightly swollen, or rough to the touch. In some people, the rash is subtle and looks like a sunburn. In others, it’s vivid and hard to miss.
The Lupus Connection
Between 30 and 50 percent of people with SLE develop a butterfly rash at some point. It falls under a category called acute cutaneous lupus erythematosus, and its presence is one of the 11 criteria the American College of Rheumatology uses to help diagnose SLE. A butterfly rash doesn’t confirm lupus on its own, but it’s a strong signal. When it appears, it often coincides with active systemic disease, and doctors will typically evaluate for kidney inflammation, blood abnormalities, and inflammation of the membranes around the heart and lungs.
Not everyone with lupus gets a butterfly rash, and not everyone with a butterfly rash has lupus. But the overlap is significant enough that an unexplained malar rash, especially in a young woman, will prompt blood work to check for lupus-related antibodies.
Why Sunlight Makes It Worse
UV radiation is the most common trigger. In people with lupus, the immune system reacts abnormally to sun-exposed skin cells. Here’s what happens at a basic level: UV light, particularly UVB rays, damages skin cells and causes some to die. In a healthy body, these dying cells are cleaned up quietly. In lupus, the immune system treats them as threats, attacking the debris and triggering inflammation.
This process is compounded by a few other problems. Lupus patients tend to have higher-than-normal levels of immune signaling molecules called interferons, which ramp up inflammation further when UV exposure increases their production. Their skin cells also repair UV-related DNA damage less efficiently, letting inflammation build instead of resolve. On top of that, autoantibodies in the skin form clusters called immune complexes when exposed to UV light, which activate additional inflammatory pathways. The result is a visible, sometimes painful rash in sun-exposed areas, with the cheeks and nose being especially vulnerable.
Other Triggers Beyond Sunlight
While UV exposure is the classic trigger, a butterfly rash can flare up in response to other environmental factors too. Stress, heat, and illness can all provoke a flare. Triggers vary from person to person, and some people notice their rash worsens with certain skincare products or after periods of poor sleep. Tracking your personal triggers can help you reduce flare frequency over time.
Once triggered, the rash may fade within a few days with treatment. In other cases, it takes several weeks for the skin to fully heal.
Butterfly Rash vs. Rosacea
Rosacea is the condition most frequently confused with a lupus butterfly rash because both cause facial redness across the cheeks and nose. But there are reliable differences.
- Pimples and visible blood vessels: Rosacea often produces pus-filled bumps and visibly swollen blood vessels beneath the skin. A lupus rash does not.
- Raised border: The lupus butterfly rash typically has a raised edge along its outer border. Rosacea lacks this.
- Systemic symptoms: Rosacea stays confined to the face. Lupus frequently causes joint pain, fatigue, fevers, and other body-wide symptoms alongside the rash.
Other conditions that can produce a similar facial rash include dermatomyositis (a connective tissue disorder that also causes muscle weakness) and seborrheic dermatitis (a form of eczema affecting the face and scalp). A doctor can usually differentiate these through a combination of physical exam, blood tests, and sometimes a skin biopsy.
How It’s Treated
Sun protection is the foundation of managing a butterfly rash linked to lupus. Broad-spectrum sunscreen, protective clothing, and avoiding peak UV hours can prevent flares before they start.
For active rashes, current guidelines recommend a topical cream that calms the immune response in the skin as first-line treatment, particularly for facial lesions. This class of medication works by suppressing the overactive immune cells locally without thinning the skin the way steroid creams can over time. Topical steroids are also used, especially for more intense flares, but doctors tend to limit their long-term use on the face.
When the rash is widespread or there’s a risk of scarring, oral medications originally developed as antimalarials are typically added. These work systemically to quiet the immune system’s overreaction and are a cornerstone of lupus treatment more broadly, helping manage skin symptoms alongside joint pain and fatigue.
What a Butterfly Rash Can Signal
A butterfly rash isn’t just a cosmetic issue. Because it’s highly predictive of active systemic lupus, its appearance can serve as an early warning sign that the disease is flaring internally. Lupus can affect the kidneys, heart lining, lungs, and blood cells, sometimes without obvious symptoms until significant damage has occurred. The rash, visible and hard to ignore, can prompt the evaluation that catches these problems early.
If you develop an unexplained rash across both cheeks and the bridge of your nose, especially if it worsens in the sun or comes alongside fatigue, joint pain, or mouth sores, getting it evaluated is worthwhile. Early identification of lupus leads to better long-term outcomes, and the butterfly rash is one of the most recognizable signals the disease gives.