Cracks in the corners of your mouth, known medically as angular cheilitis, are usually caused by a combination of moisture buildup and infection. Treatment depends on the underlying cause, but most cases clear up within two weeks using a combination of antifungal cream and a barrier ointment to keep the area dry. The key to healing is addressing both the infection and the moisture that created it.
What Causes the Cracking
Angular cheilitis starts when saliva collects in the creases at the corners of your mouth. That constant moisture softens and breaks down the skin, a process called maceration. Once the skin barrier is compromised, fungal or bacterial organisms move in and prevent healing. The result is a painful cycle: the cracked skin traps more moisture, which feeds the infection, which keeps the skin from repairing itself.
Several things make saliva pooling more likely. Ill-fitting dentures that change the shape of your lower face are one of the most common culprits, because they create deeper skin folds where moisture collects. Habitual lip licking deposits small amounts of saliva into those creases throughout the day. Wearing masks for long periods, using pacifiers, and drooling during sleep can all do the same thing. People with diabetes, weakened immune systems, or who use steroid inhalers also face a higher risk.
The Role of Nutritional Deficiencies
Nutritional deficiencies account for about 25% of all angular cheilitis cases. The most common ones are iron deficiency and deficiencies in several B vitamins: riboflavin (B2), niacin (B3), pyridoxine (B6), and B12. These nutrients all play a role in maintaining healthy skin and mucous membranes, so when levels drop low enough, the skin at the corners of your mouth becomes more fragile and vulnerable to breakdown.
If your cracks keep coming back or don’t respond to topical treatment, a blood test for iron and B vitamin levels is worth pursuing. In one documented case published in the Cleveland Clinic Journal of Medicine, a patient’s angular cheilitis resolved only after treating severe iron deficiency anemia, with ferritin levels that had dropped to 1.3 ng/mL (normal starts at 15).
Antifungal Cream as First-Line Treatment
Because fungal infection is the most common infectious cause, an antifungal cream is typically the first treatment. Miconazole 2% cream, applied to the corners of the mouth every 12 hours for 10 to 14 days, is the standard recommendation in clinical guidelines. You can find miconazole over the counter in most pharmacies, usually marketed for athlete’s foot or yeast infections, but the same cream works here.
Apply a thin layer directly to the cracked area twice a day, morning and evening. Consistency matters. Stopping early because the cracks look better often leads to a relapse, since the fungal organisms can survive beneath healed-looking skin. Complete the full 10 to 14 days even if symptoms improve sooner.
Why Barrier Ointment Is Just as Important
Between antifungal applications, you should coat the corners of your mouth with a thick barrier ointment like petroleum jelly or zinc oxide paste. This serves two purposes: it physically blocks saliva from reaching the damaged skin, and it creates a protective environment that helps new skin cells grow back faster.
Think of the barrier ointment as the other half of treatment. The antifungal fights infection while the barrier breaks the moisture cycle that started the problem. Without it, saliva keeps softening the skin and reintroducing the conditions for infection. Reapply the barrier ointment after eating, drinking, or anytime you notice the area feels wet.
When Inflammation Needs Extra Help
If the corners of your mouth are significantly red, swollen, or painful, a low-potency steroid cream like hydrocortisone 1% can calm the inflammation. However, the skin around your mouth is thin and particularly sensitive to steroid side effects, including further thinning, redness, and scaling. Use it only for a short period and only alongside (never instead of) the antifungal treatment. If you’re applying it without medical guidance, limit use to a few days and stop if you notice any changes in skin texture.
Treating Bacterial Infections
Sometimes the infection is bacterial rather than fungal, or both organisms are present at the same time. If the area develops a yellowish crust, oozes, or doesn’t improve after a week of antifungal treatment, a bacterial component is likely. In these cases, a healthcare provider can do a swab to identify the specific organism and prescribe an appropriate antibiotic ointment. Mixed infections, where both fungus and bacteria are involved, are common enough that some providers treat for both from the start.
What Not to Do
The most counterproductive thing you can do is lick the cracked corners of your mouth. It feels soothing for a moment, but saliva contains digestive enzymes that further break down already-damaged skin. Flavored or medicated lip balms with ingredients like menthol, camphor, or eucalyptus can also irritate the area. Stick to plain, unfragranced petroleum jelly or a simple emollient ointment instead.
Avoid picking at crusts or peeling flaking skin. The crust that forms over the cracks is part of the healing process, and removing it reopens the wound and extends recovery time.
Preventing It From Coming Back
Once your cracks heal, prevention comes down to keeping the corners of your mouth dry and your skin healthy. A few practical changes make a real difference:
- Break the lip-licking habit. Carry a plain lip balm or petroleum jelly and reach for it whenever you feel the urge to lick.
- Fix ill-fitting dentures. If your dentures have changed the height of your lower face or create deep folds at the mouth corners, have them refitted by your dentist.
- Rinse after using steroid inhalers. Inhaled corticosteroids for asthma or COPD encourage fungal growth in and around the mouth. Rinsing with water after each use reduces this risk significantly.
- Address nutritional gaps. If blood work reveals low iron or B vitamins, supplementation can prevent recurrence. Foods rich in B2 include eggs, dairy, and leafy greens. Red meat, beans, and fortified cereals are good iron sources.
- Manage blood sugar. Poorly controlled diabetes creates conditions that favor fungal growth. Keeping blood glucose in a healthy range reduces your susceptibility.
- Maintain good oral hygiene. Clean dentures daily, and keep your mouth and the skin around it as clean and dry as practical, especially overnight.
For people whose angular cheilitis recurs because of deep skin folds at the mouth corners, whether from aging, weight loss, or facial structure, dermal filler injections can build up the tissue at the mouth commissures. This reduces the depth of the creases where saliva collects and can be a lasting solution for chronic cases that don’t respond to other prevention strategies.