Angular cheilitis, the cracked, red, sometimes crusty splits at the corners of your mouth, is treatable and typically clears up within about two weeks once you address the underlying cause. The key is figuring out whether the problem is fungal, bacterial, or both, and then keeping the area dry and protected while it heals.
What Causes the Cracks
Angular cheilitis starts when saliva pools in the skin folds at the corners of your mouth. That constant moisture breaks down the skin barrier, creating a warm, damp environment where microbes thrive. The most common culprit is a yeast called Candida, though bacteria like Staphylococcus aureus and streptococci can also move in. Many cases involve both yeast and bacteria at the same time, which is why treatment sometimes needs to cover more than one type of infection.
Several things make saliva pooling more likely. Dentures that don’t fit well or have lost vertical height can change the shape of your bite, deepening the skin folds at the corners of your mouth. Age-related changes to facial structure do the same thing. Lip licking is another common trigger: it feels soothing in the moment, but it deposits more saliva and strips the skin of its natural oils, making the cycle worse.
First-Line Treatments
Because most angular cheilitis involves a fungal component, an antifungal cream is the standard starting point. Your doctor or dentist will typically prescribe a topical antifungal, and if bacteria are suspected, a topical antibiotic cream as well. These two are sometimes used together, applied directly to the corners of the mouth. Improvement usually shows within the first few days, and full resolution takes roughly two weeks.
Between applications of your medicated cream, apply a barrier ointment like petrolatum (plain petroleum jelly) or zinc oxide. This keeps saliva from re-wetting the area and speeds up skin repair. Think of the barrier as the other half of the treatment: the antifungal kills the infection, and the barrier stops the conditions that let it grow in the first place.
Why Steroids Can Backfire
It might seem logical to use a steroid cream to calm the redness and inflammation, but this is one situation where that instinct can make things worse. Topical corticosteroids are contraindicated in active microbial infections. They suppress the immune response in the skin, which can let yeast and bacteria multiply faster and even spread. Guidelines from the University of Iowa’s head and neck protocols note that angular cheilitis only rarely requires anti-inflammatory agents, and steroid creams should not be used alongside antifungal or antibiotic treatment unless a specialist has specifically recommended it for a complicating factor.
Nutritional Deficiencies to Consider
If your angular cheilitis keeps coming back or doesn’t respond to topical treatment, a nutritional deficiency may be the underlying driver. Riboflavin (vitamin B2) deficiency is one of the most well-established links. The earliest signs of low riboflavin are pallor and softening of the tissue at the corners of the mouth, eventually replaced by the shallow linear cracks characteristic of angular cheilitis. Iron deficiency and deficiencies in other B vitamins can produce similar effects by weakening the skin and mucous membranes.
A blood test can check your levels. If a deficiency is confirmed, correcting it through diet or supplementation often resolves the problem when topical treatments alone haven’t worked. Good dietary sources of riboflavin include dairy, eggs, lean meats, and fortified cereals.
Denture-Related Cases
For denture wearers, angular cheilitis is especially common. Poorly fitting dentures harbor yeast and can reduce the vertical dimension of your bite, meaning the distance between your upper and lower jaw when your mouth is closed. When that distance shrinks, the skin at the corners of your mouth folds over more deeply, creating a pocket where saliva collects. Treating the infection topically will help in the short term, but if the structural issue isn’t fixed, the problem will return. In some cases, having new dentures made with a corrected bite height is the only lasting solution. Keeping dentures clean and removing them at night also reduces yeast buildup.
How It Differs From Cold Sores
People often confuse angular cheilitis with cold sores, but they look and behave differently. Cold sores are caused by the herpes simplex virus and typically appear as clusters of small, fluid-filled blisters on or near the lips, not exclusively in the corners. They tingle or burn before they appear, then crust over as they heal. Angular cheilitis, by contrast, stays confined to the corners of the mouth, doesn’t form blisters, and presents as red, cracked, sometimes weepy skin. The distinction matters because the treatments are completely different: antiviral medication for cold sores, antifungal or antibacterial treatment for angular cheilitis.
What You Can Do at Home
While waiting for treatment to work, or for mild cases you’re managing on your own, a few habits make a real difference. Stop licking your lips, even when the dryness feels unbearable. Apply petroleum jelly or a zinc oxide ointment to the corners of your mouth several times a day, especially before bed and after eating. Keep the area as dry as possible between barrier applications.
Some people turn to natural remedies like olive oil. There is laboratory evidence that compounds found in olive oil, including one called hydroxytyrosol, have antifungal and antibacterial properties. Studies have shown these compounds can damage the cell membranes of both yeast and staph bacteria in controlled settings. However, lab activity doesn’t always translate to clinical effectiveness on skin, and olive oil alone is unlikely to clear an established infection. It’s reasonable as a moisturizing barrier, but not as a replacement for antifungal treatment if the infection isn’t resolving.
When It Keeps Coming Back
Recurrent angular cheilitis signals that something beyond the surface infection needs attention. The most common underlying factors are nutritional deficiencies, ill-fitting dental appliances, and conditions that suppress the immune system. Diabetes has been studied as a potential risk factor, but research suggests that diabetes alone isn’t a primary driver. Rather, it’s the combination of factors like vitamin deficiencies, reduced bite height, and bacterial coinfection that tips the balance. If you’re dealing with repeated episodes, it’s worth getting a comprehensive evaluation that looks at your nutritional status, dental fit, and any systemic health conditions that might be contributing.