Cracked corners of the mouth, known as angular cheilitis, typically heal within about two weeks once you start the right treatment. The key is addressing two things at once: killing the infection causing the crack and protecting the area from the moisture that keeps it from healing. Most cases respond well to over-the-counter treatments, but some need a bit more investigation into underlying causes.
Why the Corners of Your Mouth Crack
Saliva pools in the creased skin at the corners of your mouth, creating a warm, moist environment where yeast and bacteria thrive. The most common culprits are a type of yeast called Candida and, less frequently, Staphylococcus bacteria. The moisture breaks down the skin, the organisms move in, and the result is redness, cracking, and sometimes crusting or bleeding that refuses to heal on its own.
Several things increase saliva pooling at the corners. Lip licking is the most obvious, but poorly fitting dentures, braces, or even sleeping with your mouth open can do it. People who wear masks for long stretches may notice it more, since trapped moisture accelerates the cycle. Once the skin barrier breaks, every time you eat, talk, or yawn, the crack re-opens and restarts the irritation.
Over-the-Counter Treatments That Work
Because yeast is the most common cause, an antifungal cream is your best first step. Any over-the-counter antifungal sold for athlete’s foot or yeast infections will work: clotrimazole (Lotrimin), terbinafine (Lamisil), or miconazole (Monistat) are all effective options. Apply a thin layer to the cracked corners twice a day for up to two weeks.
Equally important is a barrier layer. After applying the antifungal, seal the area with petroleum jelly or a healing ointment like Aquaphor. This does two things: it locks out saliva so the skin can actually repair itself, and it prevents the friction that reopens the crack every time you move your mouth. Many people skip the barrier step and wonder why the antifungal alone isn’t working. Without it, saliva keeps reintroducing moisture and the infection cycle continues.
Avoid using a steroid cream (like hydrocortisone) on its own. While it reduces redness and inflammation, it does nothing to treat the underlying fungal infection, and the crack will come right back once you stop. If inflammation is severe, a short course of low-dose steroid alongside an antifungal can help, but the antifungal is the non-negotiable piece. Prolonged steroid use on facial skin carries its own risks, including thinning of the skin.
Natural Remedies Worth Trying
If you prefer to start with what you have at home, a few natural options have genuine antimicrobial properties. Coconut oil is both antifungal and antibacterial, and it doubles as a moisturizing barrier. Apply a thin layer to the affected corners several times a day. Honey has well-documented wound-healing and antimicrobial effects and can be dabbed on the cracks to reduce symptoms. Aloe vera gel soothes inflammation and keeps the area hydrated without trapping the kind of moisture that feeds infection.
Tea tree oil is a stronger antifungal, but it needs to be diluted with a carrier oil (like coconut or olive oil) before you put it near your mouth. Undiluted tea tree oil on broken skin can cause burning and further irritation, making things worse. If natural remedies haven’t improved the crack after a week, switch to an OTC antifungal. The longer a crack stays open, the harder it becomes to break the cycle.
When a Vitamin Deficiency Is the Real Problem
Nutritional deficiencies account for roughly 25% of all angular cheilitis cases. The nutrients most strongly linked to these cracks are iron, riboflavin (B2), niacin (B3), pyridoxine (B6), and B12. If your cracks keep coming back despite proper treatment, or if you notice other symptoms like fatigue, a pale or sore tongue, or general weakness, a deficiency is worth investigating.
Iron deficiency is particularly well documented as a cause. In published case reports, patients with chronic angular cheilitis that didn’t respond to topical treatment saw their cracks clear completely once iron levels were restored, though full correction took several months. A simple blood test can check your iron stores, B vitamin levels, and overall blood counts. This is especially worth pursuing if you follow a restricted diet, have heavy menstrual periods, or have a condition that affects nutrient absorption.
Angular Cheilitis vs. Cold Sores
It’s easy to confuse a cracked mouth corner with a cold sore, but they behave differently and need different treatments. Cold sores are caused by the herpes simplex virus and typically appear as a cluster of small, fluid-filled blisters on or near the lips. They tingle or burn before they appear, then blister, weep, and crust over in a predictable pattern.
Angular cheilitis stays confined to the corners of the mouth. It looks more like a split or fissure in the skin, often with surrounding redness and sometimes a whitish, flaky coating (a sign of yeast). There’s no tingling prodrome and no fluid-filled blisters. If you’re treating a “cold sore” at the corner of your mouth with antiviral cream and it’s not improving, you likely have angular cheilitis instead, and an antifungal will be far more effective.
Preventing It From Coming Back
Once you’ve healed the crack, prevention is about managing moisture. Apply petroleum jelly or a thick lip balm to the corners of your mouth before bed, especially if you sleep with your mouth open or tend to drool. During the day, resist the urge to lick your lips. Saliva evaporates quickly and leaves the skin drier than before, restarting the cycle.
If you wear dentures, fit and hygiene matter enormously. Dentures that don’t maintain the proper vertical height of your bite cause the skin at the corners to fold over on itself, trapping saliva in the crease. If your dentures are old or loose, getting them adjusted or replaced can eliminate the problem entirely. Clean dentures thoroughly each night to remove yeast that colonizes the surface.
For people who get recurring episodes, keeping a barrier cream on the corners of the mouth as a daily habit, not just during flare-ups, is the single most effective prevention strategy. Think of it like moisturizing dry hands in winter: the goal is to stop the problem before the skin breaks down, not to chase it after the crack has already formed.
What to Expect During Healing
With consistent twice-daily antifungal treatment and a barrier cream, most cracks improve noticeably within a few days and fully resolve within two weeks. The redness fades first, followed by the crack itself closing and the skin returning to normal texture. During healing, try to minimize how wide you open your mouth when eating. Cutting food into smaller pieces and avoiding acidic or spicy foods that sting the open skin makes the process less painful.
If two weeks of OTC treatment haven’t made a meaningful difference, the infection may be bacterial rather than fungal, or a combination of both. At that point, a healthcare provider can swab the area to identify the exact organism and prescribe a targeted treatment. Persistent or frequently recurring cracks also warrant bloodwork to rule out the nutritional deficiencies that keep the skin vulnerable to breakdown.