Angular cheilitis, those painful cracks and sores at the corners of your mouth, typically clears up within two weeks once you treat the underlying cause. Fixing it requires a two-part approach: eliminating the infection driving the irritation and protecting the skin from the moisture that caused it in the first place.
What Causes the Cracking
Angular cheilitis starts with moisture. Saliva pools in the creased skin at the corners of your mouth, and the enzymes in saliva (designed to break down food) slowly break down the skin itself. This creates soft, irritated tissue that fungi and bacteria colonize quickly. The most common culprits are Candida (a yeast that naturally lives in your mouth) and Staphylococcus aureus bacteria. Once infection sets in, the area becomes red, cracked, crusty, or blistered, and it won’t heal on its own because the moisture cycle keeps repeating.
Several things make saliva pooling worse. Lip licking is the most obvious one: the more you lick your lips to soothe the dryness, the more enzymes you deposit on already damaged skin. Drooling during sleep has the same effect. Deeper facial folds at the mouth corners, whether from aging, weight loss, or missing teeth, create a physical pocket where saliva collects. Dentures that don’t restore the full height of the lower face cause the skin around the mouth to fold inward, trapping moisture and leading to secondary infection.
Treating the Infection
Because angular cheilitis is almost always an infection, the fastest fix is a targeted topical medication. Which one depends on whether yeast or bacteria is responsible, and sometimes both are involved at once.
For fungal infections (the more common cause), an over-the-counter antifungal cream applied to the corners of the mouth three times daily for two weeks is the standard approach. Look for creams containing clotrimazole or miconazole, the same active ingredients used for athlete’s foot. For bacterial infections, a topical antibiotic ointment applied for one to two weeks handles most cases. If you’re not sure which type of infection you’re dealing with, a doctor or dentist can swab the area and tell you, or may prescribe a combination treatment that covers both.
Most people notice improvement within the first few days of starting the right treatment. Full resolution typically takes about two weeks. If you’re still dealing with cracking and redness after that point, the original diagnosis may need revisiting, either because the wrong type of infection was targeted or because an underlying cause hasn’t been addressed.
Protecting the Skin While It Heals
Medication alone won’t fix angular cheilitis if saliva keeps breaking down the skin. An occlusive barrier, something that physically blocks moisture from reaching the irritated corners, is just as important as the antifungal or antibiotic you’re using. Petroleum jelly (Vaseline) or a thick emollient like Aquaphor applied over the cracked area several times a day creates a waterproof seal that keeps saliva enzymes off the healing skin.
This barrier step is the piece most people skip, and it’s the main reason the condition comes back. Even after the infection clears, the skin at the corners of your mouth remains vulnerable. Continuing to apply petroleum jelly multiple times a day, especially before bed and after eating, prevents the saliva-driven irritation cycle from restarting. Think of it less as a treatment phase and more as ongoing maintenance for as long as you’re prone to moisture buildup in that area.
Addressing the Root Cause
If angular cheilitis keeps returning despite proper treatment, something structural or nutritional is likely feeding the cycle.
Dentures and Dental Issues
Poorly fitting dentures are one of the most common drivers of recurring angular cheilitis. When dentures don’t restore the original vertical height of the lower face, the skin around the mouth collapses inward, creating deeper folds at the corners where saliva accumulates. Research consistently links this loss of facial height to angular cheilitis in denture wearers. If you wear dentures and keep getting corner-of-mouth sores, ask your dentist to evaluate whether your dentures need relining or replacement to restore proper facial proportions. Keeping dentures clean also matters, since yeast can colonize the denture surface and reinfect the mouth repeatedly.
Nutritional Deficiencies
Low levels of iron, zinc, and B vitamins (especially B2 and B12) weaken the skin and mucous membranes around the mouth, making them more susceptible to breakdown and infection. If your angular cheilitis keeps coming back without an obvious structural cause like dentures, it’s worth having your levels checked through a blood test. Correcting a deficiency often stops the recurrence cycle entirely. Iron-rich foods include red meat, lentils, and spinach. Zinc is abundant in shellfish, seeds, and nuts. B12 comes primarily from animal products, so vegetarians and vegans are at higher risk of deficiency.
Immune and Systemic Factors
Anything that suppresses your immune system makes it harder for your body to keep Candida in check. Diabetes, HIV, long-term steroid use (including inhaled steroids for asthma), and recent antibiotic courses all raise the risk. If you use a steroid inhaler, rinsing your mouth after each use helps reduce yeast overgrowth. Managing blood sugar effectively if you have diabetes also lowers your susceptibility.
Angular Cheilitis vs. Cold Sores
It’s easy to confuse the two, but they’re different conditions with different treatments. Cold sores (caused by herpes simplex virus) typically appear on or near the lips as clusters of small, fluid-filled blisters, and they can show up anywhere around the mouth. Angular cheilitis stays specifically in the corners, presents as cracks, redness, and crusting rather than blisters, and is caused by fungal or bacterial infection rather than a virus. Antiviral cold sore creams won’t help angular cheilitis, and antifungal creams won’t help cold sores, so getting the distinction right matters for choosing effective treatment.
Breaking the Habit Loop
The single most important behavioral change is to stop licking your lips, particularly the corners. This is harder than it sounds because the cracking feels dry, and licking provides momentary relief. But every lick deposits a fresh layer of digestive enzymes on damaged skin. When you feel the urge, apply petroleum jelly instead. It addresses the dryness sensation without the enzymatic damage.
Staying hydrated helps reduce the urge to lick. Breathing through your nose rather than your mouth, especially during sleep, limits overnight saliva exposure. If you tend to drool at night, sleeping on your back can help. For people who live in dry climates, a humidifier in the bedroom keeps lips from drying out and triggering the lick-and-crack cycle.
Once you’ve cleared an episode, the combination of regular petroleum jelly application, good nutrition, and breaking the lip-licking habit is usually enough to keep angular cheilitis from coming back. For denture wearers, proper fit and daily denture hygiene are non-negotiable additions to that prevention plan.