Corners of the mouth cracking is most often caused by angular cheilitis—a common inflammatory condition triggered by saliva pooling, fungal or bacterial infection, and nutritional deficiencies. Most cases clear within two weeks with antifungal or antibiotic creams, lip moisturizers, and diet changes. See a dentist if cracks or lumps persist.
Few things are as annoying as a stubborn crack at the corner of your mouth. It stings when you smile, burns when you eat something acidic, and seems to come back the moment you think it’s healed. If you’ve also noticed a lump or bump along the inside of your cheek, you might be wondering whether the two are connected—or whether either is something to worry about.
The good news? Both cracked lip corners and most lumps in the side of the mouth are usually harmless and treatable. The medical name for those painful splits is angular cheilitis, and the causes range from dry skin to vitamin deficiencies. Lumps, meanwhile, are often benign growths or cysts that resolve on their own.
This guide breaks down what causes the corners of your mouth to crack, what those lumps in your mouth might be, and how to prevent and treat both. You’ll also learn the warning signs that mean it’s time to see a professional. For ongoing care, the team at 5 Mile Smiles, your trusted dentist in Spokane, can help diagnose and treat persistent oral issues.
Key Takeaways
- Angular cheilitis is the main cause of corners of mouth cracking, often linked to saliva, fungal or bacterial infection, and low levels of iron, zinc, or B vitamins.
- Most cracks heal within two weeks with the right treatment, which may include antifungal creams, antibiotic ointments, and diet changes.
- Lumps in the side of the mouth are usually benign—think mucoceles, fibromas, or canker sores—and many clear up on their own.
- Prevention centers on good oral hygiene, a balanced diet, hydration, and avoiding habits like lip-licking and cheek-biting.
- See a dentist if a crack or lump lasts more than two weeks, grows, changes color, or makes eating and speaking difficult.
What Causes the Corners of Your Mouth to Crack?
Angular cheilitis is a common inflammatory skin condition that affects one or both corners of your mouth, leading to cracked, irritated sores. According to the Cleveland Clinic, the condition is also known as angular stomatitis or perleche, and while it’s painful, it usually isn’t serious. People often mistake it for cold sores, but unlike cold sores, angular cheilitis isn’t contagious.
The trouble usually starts with moisture. Saliva collects at the corners of your mouth, and over time, this constant dampness dries out and cracks the skin. Once the skin splits, bacteria or fungi can move into those cracks and cause inflammation or infection.
What does angular cheilitis look and feel like?
The symptoms tend to show up right at the corners of your mouth and may include redness, swelling, cracking, crusting, blisters, and bleeding. You might also notice maceration, where the skin looks soggy and lighter in color.
The area often feels tender or sore, especially when you open your mouth wide or eat something salty or acidic.
What are the main causes of cracked lip corners?
Several factors can dry out and irritate the corners of your mouth enough to trigger angular cheilitis. Common culprits include:
- Nutritional deficiencies: Low levels of iron, B vitamins, or zinc can leave skin more vulnerable to cracking.
- Fungal infections: Candida (the same yeast behind oral thrush) often thrives in the moist corners of the mouth.
- Bacterial infections: Staphylococcus bacteria can settle into the cracks and worsen the irritation.
- Saliva pooling and maceration: Drooling during sleep or constantly licking your lips keeps the area wet.
- Dental appliances: Dentures that don’t fit well or misaligned teeth can contribute to dry, cracked corners.
- A weakened immune system: Conditions like diabetes, HIV, or inflammatory bowel disease raise your risk.
- Allergic reactions: Sensitivity to lip products, toothpastes, or other irritants can spark a flare-up.
The condition is most common in very young and older people. Infants who use pacifiers or suck their thumbs, and elderly people with sagging skin around the mouth, are both more prone to it.
What Could a Lump in the Side of Your Mouth Be?
Finding a lump inside your cheek can be alarming, but most are benign and tied to minor trauma or blocked glands.
Still, it helps to know what you might be dealing with so you can decide whether to wait it out or get it checked.
What are the most common benign causes of mouth lumps?
Here are the harmless growths and bumps that most often appear inside the mouth:
- Mucoceles and ranulas: A mucocele is a painless, fluid-filled cyst that usually forms after you bite your lip and damage a salivary gland. According to the Cleveland Clinic, mucoceles occur in about 2.4 of every 1,000 people and most often affect those under 30. A ranula is the same type of cyst, but on the floor of the mouth.
- Fibromas: Oral fibromas are smooth, noncancerous bumps that form where your upper and lower teeth meet, usually because of repeated irritation or cheek-biting. They’re sometimes called irritation or traumatic fibromas.
- Cysts: Dental and other small cysts can develop in the soft tissues of the mouth.
- Torus palatinus or mandibularis: These are harmless bony growths—one on the roof of the mouth, the other along the lower jaw.
- Canker sores (aphthous ulcers): These small white or yellowish ulcers can result from minor trauma, like biting your cheek, or from stress and acidic foods.
Most mucoceles rupture and heal on their own, and many fibromas need no treatment unless they get in the way. The key is managing whatever is causing the irritation in the first place.
When should a lump in the mouth worry you?
Most lumps are nothing serious, but a few signs deserve attention. Watch for a lump that keeps growing, changes color or texture, doesn’t go away after two weeks, or comes with persistent pain.
Cracked corners aren’t always angular cheilitis either—conditions like leukoplakia, oral lichen planus, and, rarely, oral cancer can cause similar sores. If something doesn’t look or feel right, a professional evaluation is the safest move.
How Can You Prevent Cracked Mouth Corners and Mouth Lumps?
Prevention comes down to a few consistent habits that keep your skin and oral tissues healthy.
Small daily changes can make a real difference in stopping flare-ups before they start.
Maintain good oral hygiene and dental care
Brushing twice a day, flossing, and seeing your dentist regularly helps keep harmful bacteria and fungi in check. Routine checkups also catch problems early, before they turn into something painful.
Booking regular general dental care in Spokane gives your dentist a chance to spot issues like ill-fitting dentures or developing gum problems that can contribute to cracked corners.
Eat a balanced diet and address deficiencies
Since low iron, zinc, and B vitamins are linked to angular cheilitis, eating foods rich in these nutrients can help. The Cleveland Clinic notes that dietary changes—adding protein, iron, and B vitamins—can clear up cracks caused by poor nutrition.
If you suspect a deficiency, talk to a healthcare provider before starting supplements like B-complex or iron.
Keep your lips and mouth moisturized
Apply a lip balm or petroleum jelly to lock in moisture and protect the corners of your mouth. Look for products with emollients and humectants, and skip heavily flavored balms that can irritate the skin.
Drinking plenty of water also helps keep your whole mouth hydrated. And resist the urge to lick your lips—it feels soothing for a second but dries them out even more.
Care for your dental appliances
If you wear dentures, braces, or a retainer, make sure they fit correctly and stay clean. Poorly fitting appliances are a frequent trigger for cracked corners.
A quick adjustment from your dentist can solve the problem.
How Do You Treat Cracked Corners of the Mouth?
Treatment depends on what’s causing the crack, so the right fix varies from person to person.
The plan often combines a topical product with a change in habits or diet.
What over-the-counter and prescription options work?
For mild cases, an antifungal cream tackles yeast, while an antibiotic ointment handles bacterial infections. Topical steroids can ease swelling and pain, and a good lip balm keeps the area protected as it heals.
If the cracks are stubborn or keep coming back, a healthcare provider may prescribe stronger antifungal or antibiotic treatments. They might also run a blood test to check for nutritional deficiencies or a mouth swab to identify the infection.
Do home remedies help?
Some people find relief with gentle home approaches while the area heals. Applying a cool compress can reduce pain and swelling, and natural moisturizers like coconut oil may help keep the skin supple. Just remember that home care works best alongside—not instead of—proper treatment. Importantly, don’t try to pop or drain a mucocele yourself; doing so can cause infection or tissue damage.
According to the Cleveland Clinic, angular cheilitis usually clears up about two weeks after starting treatment. If yours doesn’t, that’s a sign to get professional help.
When Should You See a Dentist or Doctor?
Most cracks and lumps clear up on their own, but some situations call for expert care. It’s worth booking an appointment if you notice any of these:
- A crack or lump that lasts longer than two weeks
- Pain, spreading inflammation, or signs of infection
- Difficulty eating, chewing, or speaking
- A lump that changes in size, color, or texture
Early diagnosis makes treatment faster and more effective. Dr. Jason Keefe and the team at 5 Mile Smiles bring more than 25 years of experience to diagnosing and treating oral health concerns. If your symptoms come on suddenly or involve a soft tissue injury, our dental emergency services offer same-day appointments.
For ongoing gum and tissue health, our periodontics care can also help address underlying issues.
Frequently Asked Questions
Q: Are cracked corners of the mouth contagious?
A: No. Angular cheilitis itself isn’t contagious, which sets it apart from cold sores caused by the herpes virus. However, the fungi or bacteria involved in a flare-up can spread in other ways, so good hygiene still matters.
Q: How long does it take for cracked mouth corners to heal?
A: With the right treatment, angular cheilitis usually heals within about two weeks. If your cracks last longer or keep returning, it’s a good idea to see a dentist or doctor to rule out an underlying cause like a nutritional deficiency or chronic infection.
Q: Can a lump in the side of my mouth go away on its own?
A: Often, yes. Many mucoceles rupture and heal naturally, and minor irritation bumps can fade once the source of irritation is removed. That said, any lump that grows, changes, or lingers beyond two weeks should be evaluated by a professional.
Q: Are mouth lumps a sign of cancer?
A: Most are not. The vast majority of mouth lumps are benign growths like fibromas, mucoceles, or canker sores. Still, because rare conditions like oral cancer can cause persistent lumps or sores, it’s important to get anything unusual checked, especially if it doesn’t heal.
Q: Can vitamin deficiencies really cause cracked lips?
A: Yes. Low levels of iron, zinc, and B vitamins are well-documented triggers for angular cheilitis. A balanced diet—and supplements if a provider recommends them—can help resolve and prevent cracks tied to nutrition.
Taking Care of Your Mouth, Inside and Out
Cracked corners and unexpected lumps are common, usually harmless, and very treatable. Angular cheilitis tends to respond well to a mix of moisturizing, the right topical treatment, and good nutrition, while most mouth lumps fade once the underlying irritation is addressed.
The simplest path to prevention is consistency: brush and floss daily, eat a varied diet, stay hydrated, and skip habits like lip-licking and cheek-biting.
When something doesn’t heal or simply doesn’t feel right, don’t wait it out indefinitely. A quick visit to your dentist can confirm what’s going on and get you on the path to relief. To schedule an evaluation with an experienced team in Spokane, reach out to 5 Mile Smiles and give your smile the care it deserves.
