A malar rash is a facial rash that spreads across both cheeks and the bridge of the nose in a butterfly shape. It’s one of the most recognizable signs of lupus, though it only appears in about 30% of people with systemic lupus. The rash can be flat, raised, or scaly, and it often feels itchy or burns. On lighter skin, it looks red or pink. On darker skin tones, it can appear brown, black, or purple.
What It Looks Like
The classic butterfly pattern covers the malar bones (your cheekbones) and stretches across the nose, which is how it gets both its common name and its medical one. One of the most distinctive features is that the rash spares the nasolabial folds, the creases that run from the sides of your nose down to the corners of your mouth. This detail matters because it helps distinguish a malar rash from other conditions that affect similar areas of the face.
In rare cases, the rash extends to the forehead and chin, but the cheeks-and-nose butterfly shape is the hallmark. The texture varies from person to person. Some people develop a flat discoloration that almost looks like a sunburn, while others get a raised, scaly patch. It can come and go, flaring up for days or weeks and then fading.
Why Sunlight Triggers It
Most malar rashes are photosensitive, meaning UV light makes them worse or triggers a flare. The reason involves the skin’s immune signaling. In people with lupus, cells in the top layer of skin produce abnormally high levels of an immune signaling molecule that normally helps fight off viral infections like HPV. Even without sun exposure, lupus skin has elevated baseline levels of this molecule. When UV light hits the skin, the overactive immune signal amplifies inflammation and causes skin cells to die at a much higher rate than normal.
Research from the University of Michigan demonstrated this directly: when the gene responsible for this immune signal was removed from skin cells in the lab, those cells were completely unaffected by UV light. Cells with extra-high levels of the signal died when exposed to UV. This helps explain why sun exposure is such a reliable trigger and why sun protection is central to managing the rash.
Conditions That Cause a Malar Rash
Lupus is the condition most closely associated with a butterfly rash, and in the current diagnostic criteria for systemic lupus, an acute skin rash like this carries significant weight in reaching a diagnosis. But lupus isn’t the only possibility. Rosacea, seborrheic dermatitis, and dermatomyositis can all produce facial redness in a similar area, and telling them apart matters for treatment.
Lupus vs. Rosacea
Rosacea causes facial redness that can look a lot like a lupus malar rash, but there are key differences. Rosacea typically involves the nasolabial folds, while the lupus butterfly rash skips them. Rosacea also commonly produces small bumps and pus-filled spots on the face, which rarely occur in lupus. If you have facial redness with visible bumps and pustules that extends into your laugh lines, rosacea is more likely.
Lupus vs. Seborrheic Dermatitis
Seborrheic dermatitis also affects the nasolabial folds, so the same rule of thumb applies. The distinguishing feature of seborrheic dermatitis is visible flaking or scaling, and its red patches tend to form ring-like shapes. It can also cause lighter or darker patches of skin after the redness clears, something that’s uncommon with rosacea.
Lupus vs. Dermatomyositis
Dermatomyositis produces a facial rash with a distinctive dusky, violet-toned color rather than the red or pink of lupus. It typically involves the skin around the eyes (periorbital area), which lupus usually does not. Other telltale signs include facial swelling, swollen extremities, and rough, scaly bumps over the knuckles.
How It’s Diagnosed
No single test confirms a malar rash as lupus-related. A doctor will look at the pattern, check whether the nasolabial folds are spared, and consider your other symptoms. Blood tests for specific antibodies, particularly the antinuclear antibody (ANA) test, are a standard part of the workup. In the EULAR/ACR classification system used to diagnose systemic lupus, an acute skin rash like the butterfly rash is weighted at 6 points out of the 10 needed for classification, making it one of the more significant individual criteria.
That said, having a butterfly-shaped rash on your face does not automatically mean you have lupus. Sunburns, allergic reactions, and other skin conditions can mimic the shape. The rash is evaluated alongside joint pain, fatigue, kidney function, and other systemic symptoms to build the full picture.
Treatment and Managing Flares
Treatment depends on the underlying cause. When the rash is lupus-related, hydroxychloroquine is one of the most commonly prescribed medications. Originally an antimalarial drug, it was approved for lupus symptoms in 1956 and remains a first-line treatment for skin inflammation, joint pain, and fatigue. People newly diagnosed with lupus typically start at a higher daily dose for several weeks while the medication builds up in the body, then step down to a lower maintenance dose. The amount is adjusted based on body weight, kidney function, and individual response.
Topical treatments, including prescription-strength creams that reduce inflammation, are often used alongside oral medications to calm active flares on the skin. The rash itself is generally not permanent. It tends to come and go with flares and can fade completely between episodes, though persistent or repeated flares may cause lingering discoloration in some people.
Sun Protection for Prevention
Because UV light is the most common trigger, consistent sun protection is one of the most effective things you can do to prevent flares. Lupus experts recommend sunscreen with at least SPF 30, though SPF 70 or higher is preferable. Sunscreen needs to be reapplied every two hours when you’re outdoors, and it’s easy to forget spots like the ears, neck, and lips. A wax-based lip balm with SPF 15 or higher covers the lip area specifically.
Wide-brimmed hats and UV-protective clothing add another layer of defense, especially during peak sun hours. Some people with photosensitive lupus find that even fluorescent lighting or light through car windows can provoke a mild flare, so daily sunscreen use indoors near windows is worth considering. Paying attention to your personal triggers and keeping a record of what preceded each flare can help you build a prevention routine that actually works for your skin.