“I seem to get swelling in my lower lip with lupus flares,” wrote a MyLupusTeam member. “We’re talking major, huge swelling.” If you’ve noticed lupus and lip swelling around the same time, you may wonder whether the swelling is part of a flare.

Lip swelling can happen for many reasons. Lupus-associated angioedema — swelling in deeper layers of the skin or mucous membranes — has been reported, but acquired angioedema in lupus is rare.

Lip swelling shouldn’t automatically be blamed on a lupus flare. Allergies, medications, thyroid disease, irritation, and other causes may also be involved.

This article covers possible causes of lip swelling, when swelling may need emergency care, and ways to manage or prevent symptoms.

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Lupus and Lip Swelling: Causes and Symptoms

Lupus is a chronic autoimmune disease that can affect the skin, joints, kidneys, lungs, heart, brain, blood cells, and other parts of the body. Symptoms can come and go in flares.

Angioedema can cause swelling of the face, mouth, and upper airway, and severe upper-airway swelling can be dangerous. In rare cases, acquired angioedema has been linked with systemic lupus erythematosus (SLE), the most common type of lupus. Because this connection is uncommon, it’s important to look for other causes too.

Some members of MyLupusTeam have noticed that their lips swell during lupus flares, which they describe in comments like these:

• “Every single time I flare, this happens to my upper and lower lip.”
• “I have systemic lupus and have been having more frequent bouts of lip swelling. My lower lip has swollen three nights in a row.”
• “I definitely got swelling all over my face (eyes, nose, cheeks, neck, lips, ears). My lips were enormous.”

These experiences are real, but lip swelling during a flare doesn’t prove lupus is the cause. Your healthcare team can help sort out whether the swelling is related to lupus activity, an allergic reaction, a medication side effect, or another condition.

Morning Lip Swelling and Lupus Flares

Waking up with swollen lips can be confusing, especially if you’re also having other lupus symptoms. You might wonder, “Why did I wake up with swollen lips?” Morning swelling may be related to something that happened overnight, such as contact with a lip product, food, medication, or another irritant.

Allergic reactions, hereditary angioedema, environmental factors like sunburn, and nonallergic medication can cause acute lip swelling. If you notice swelling after starting a new medicine — or even after taking a medicine for a long time — contact your doctor for advice. Don’t stop a prescribed medication unless a healthcare professional tells you to, but get urgent care if symptoms suggest a serious reaction.

Sun and Skin Sensitivity

For people living with cutaneous lupus erythematosus, or skin lupus, ultraviolet light can trigger lupus rashes or other skin problems. Sun exposure is not known to be a common cause of lupus-related lip swelling, but protecting your lips and skin can still help reduce skin flares and irritation.

For lips, dermatologists recommend a nonirritating lip balm with SPF 30 or higher before going outdoors. Lipstick, lip balm ingredients, and other substances can also trigger allergic or irritant reactions in some people.

Ulcers and Other Mouth Symptoms

People with SLE can develop sores in the mouth or nose. These sores are usually painless and often occur on the roof of the mouth. They can be different from canker sores, which are often painful.

Treat lupus mouth sores and lip swelling as potentially separate problems. If you have mouth sores, lip symptoms, dry mouth, or cracking at the corners of your mouth, talk with your healthcare team or dentist.

How To Manage Lip Swelling With Lupus

How you manage lip swelling depends on the cause. Seek emergency help for sudden swelling of the lips, mouth, tongue, or throat; trouble breathing or swallowing; or dizziness or faintness. These can signal a serious reaction.

If epinephrine has been prescribed for you, use it right away for severe allergic symptoms and call 911.

For mild or recurring swelling, these steps may help while you work with your doctor:

• Use a cold compress — If swelling is painful, cold may help soothe the area.
• Ask about allergy testing — If your lips swell often, your doctor may recommend testing to look for allergy triggers.
• Use antihistamines only when appropriate — Antihistamines may help some mild allergy symptoms, such as hives or itching, but they’re not a substitute for epinephrine during anaphylaxis.
• Choose a gentle lip balm — A nonirritating lip balm can help protect dry or cracked lips. If your lips are chapped, avoid products that burn, sting, or tingle.
• Protect your lips from the sun — Wear a nonirritating lip balm with SPF 30 or higher when you’re outside.
• Review your medications with your doctor — Ask whether any prescription or over-the-counter medicines could be contributing to swelling.

For general lupus skin care, using sun protection, avoiding tanning beds, not smoking, not picking at rashes or sores, and asking about light-sensitive medications may help reduce skin flares. Still, these steps don’t specifically treat lip swelling.

Lip swelling can signal a serious underlying problem, including an allergic reaction or, rarely, lupus-associated angioedema. Your doctor can help determine the root cause and recommend care that fits your symptoms.