Cracked lip corners, known medically as angular cheilitis, happen when saliva pools in the folds at the edges of your mouth, breaking down the skin and creating an environment where fungal or bacterial infections can take hold. Mild cases often clear up within one to two weeks with the right home care, while more stubborn or infected cases may need a targeted treatment from a healthcare provider. The fix depends on what’s causing yours, and there are usually a few overlapping factors at play.
Why Lip Corners Crack in the First Place
The corners of your mouth are a natural crease where saliva collects. When that moisture sits on the skin repeatedly, whether from lip licking, drooling during sleep, or simply the shape of your face, it softens and weakens the outer skin layer. This process is called maceration, and it’s essentially the same thing that happens when your fingers get wrinkly and tender in the bath, except it happens over days instead of minutes.
Once that skin barrier breaks down, yeast (most commonly Candida) and bacteria (often Staphylococcus) move in and colonize the raw tissue. That’s when a simple dry patch turns into something that won’t heal on its own: red, swollen, and painful cracks that may develop a whitish crust or ooze slightly. The infection feeds on the ongoing moisture, and the pain makes you lick the area more, which makes it wetter, which makes it worse. Breaking that cycle is the entire goal of treatment.
What It Looks Like at Each Stage
Early angular cheilitis shows up as pinkish redness at one or both lip corners, with the surrounding lip skin looking normal or slightly chapped. At this point, many people assume it’s just dry lips and reach for lip balm, which can help but often isn’t enough.
As it progresses, the skin becomes visibly cracked and fissured. You might notice small gray-white patches bordered by inflamed red skin. Moderate cases look scaly or papery, and the cracks can sting when you open your mouth wide to eat or yawn. In more severe cases, the fissures bleed, the area crusts over, or you see a buildup of tissue that looks granular and raw. Lesions are typically symmetrical, appearing on both sides. If only one corner is affected with no obvious explanation, that’s worth a closer look from a provider.
How to Treat Mild Cases at Home
For cracks that are recent, mildly red, and not oozing or crusted, a straightforward home routine often works:
- Apply a thick barrier ointment. Plain petroleum jelly (like Vaseline) or a zinc oxide-based ointment creates a physical shield that blocks saliva from reaching the damaged skin. Dab a small amount onto the corners of your mouth after eating, before bed, and any time you notice the area feeling wet. This is the single most important step because it interrupts the moisture cycle.
- Stop licking the area. This is harder than it sounds, especially when the skin feels tight and dry. But every time saliva hits those cracks, it resets the healing clock. The barrier ointment helps with this because it reduces the dryness sensation that triggers licking.
- Keep the area clean and dry. Gently wash the corners of your mouth with a mild cleanser once or twice a day, pat dry thoroughly, and then reapply your barrier ointment. Avoid flavored lip products, toothpaste residue sitting in the folds, and anything that could further irritate the skin.
- Try an over-the-counter antifungal cream. Since yeast is the most common infectious cause, an OTC antifungal cream (the same kind sold for athlete’s foot) applied thinly to the corners two to three times daily can help clear the infection. Apply it before your barrier ointment so it contacts the skin directly.
With consistent care, mild cases typically improve noticeably within a few days and resolve fully within one to two weeks. If you see no improvement after a week of this routine, the cause may be bacterial rather than fungal, or there may be an underlying factor keeping it going.
When You Need Stronger Treatment
Cases that don’t respond to basic home care, or that start out with significant crusting, bleeding, or pus, generally need a provider to sort out exactly what’s growing in the cracks. The diagnosis is made by looking at the area clinically, and lab testing (a swab of the affected skin) is typically reserved for stubborn cases. Based on the results, your provider may prescribe a stronger antifungal cream, an antibacterial ointment, or a combination product that addresses both at once.
A mild steroid cream is sometimes prescribed alongside the antimicrobial to calm inflammation and speed comfort. However, steroid creams should only be used on the lip area for short stretches. The skin around the mouth is thin and especially vulnerable to thinning and bruising from prolonged steroid use. If a provider prescribes one, they’ll typically limit it to a few days to a week.
Underlying Causes That Keep It Coming Back
If your lip corners crack repeatedly, something deeper is usually driving the cycle. Treating the surface infection without addressing the root cause means it will likely return.
Nutritional Deficiencies
Low levels of iron, B vitamins (especially riboflavin, also called B2), and zinc are well-established contributors to angular cheilitis. These nutrients are essential for skin repair and immune function. If your diet is limited, you’ve had recent weight loss, or you follow a restricted eating pattern, a deficiency is worth investigating with a simple blood test. Iron deficiency is particularly common in women of reproductive age, vegetarians, and people with digestive conditions that reduce absorption.
Saliva and Mouth Shape
Anything that changes how saliva flows around your mouth increases risk. Ill-fitting dentures are one of the most common culprits in older adults, as they alter the facial structure and create deeper folds at the corners where moisture gets trapped. Braces, a habit of mouth breathing, and age-related loss of facial volume can all have a similar effect. If dentures are the issue, having them refitted or adjusted can resolve the problem permanently.
Immune Suppression and Diabetes
People with diabetes are more susceptible to Candida overgrowth because elevated blood sugar creates a favorable environment for yeast. Similarly, anyone with a suppressed immune system, whether from medication, illness, or other conditions, is at higher risk for recurring infections at the lip corners. In these cases, managing the underlying condition is as important as treating the cracks themselves.
Skin Conditions
Eczema (atopic dermatitis) and seborrheic dermatitis can both affect the lip area and mimic or coexist with angular cheilitis. Allergic reactions to lip products, toothpaste ingredients, or even certain foods can cause contact cheilitis that looks very similar. If your cracked corners are accompanied by dryness, flaking, or irritation on the lips themselves or the surrounding face, an allergic or dermatitis component may be part of the picture.
Habits That Speed Healing
Beyond direct treatment, a few behavioral changes make a real difference in recovery time and prevention. Try to minimize how wide you open your mouth during the healing period. That means cutting food into smaller pieces, being conscious of yawning, and avoiding gum. Sleep position matters too: if you drool to one side, that corner is getting soaked nightly. Sleeping on your back, or at least switching sides, can help.
Keep a small tube of petroleum jelly or barrier ointment by your bed and apply it to the corners before you fall asleep. Nighttime is when the most damage happens, because you can’t control lip licking or drooling while unconscious. A heavy barrier layer at bedtime acts as overnight protection.
For long-term prevention, make sure your lip care routine includes SPF protection. Sun damage to the lip corners (actinic cheilitis) is an overlooked contributor, especially if you use sun-protective lip balm on the body of your lips but skip the corners. Apply it deliberately to the commissures, not just the middle of your lips.
Signs That Something Else Is Going On
Most cracked lip corners are straightforward angular cheilitis, but the same location can occasionally be affected by other conditions. A crack on only one side with no clear mechanical cause (like a dental issue or sleep position) warrants evaluation, as it can occasionally be a sign of something else, including early-stage infections like impetigo or, rarely, a syphilitic lesion. If the area develops honey-colored crusting that spreads, that pattern is more consistent with a bacterial skin infection that may need different treatment. And if the cracks are accompanied by sores inside the mouth, white lacy patches on the inner cheeks, or widespread facial rash, the underlying cause is likely broader than simple angular cheilitis and worth a clinical evaluation.