Cracked, sore corners of the mouth typically heal within two weeks with the right care. The condition is called angular cheilitis, and it happens when moisture collects in the skin folds at the corners of your lips, creating an environment where fungus or bacteria thrive. The good news: most cases respond to simple treatments you can start at home today.
Why the Corners of Your Mouth Crack
The creases at the corners of your mouth are a natural trap for saliva. When that skin stays damp for too long, it softens and breaks down, allowing yeast (most commonly Candida) or bacteria like Staphylococcus to move in. Once infection takes hold, the area becomes red, raw, and painful, and it splits open every time you eat, yawn, or talk. This cycle of cracking and re-cracking is what makes it feel like the sore never heals on its own.
Several things make you more prone to this:
- Lip licking or drooling during sleep, which keeps the corners perpetually wet
- Poorly fitting dentures, which change the way your lips close and allow saliva to pool at the edges
- Nutritional gaps, particularly low iron, B2 (riboflavin), B12, or zinc, all of which affect skin integrity
- Dry, cold weather, which dries and cracks the lips, giving microbes an entry point
- A weakened immune system, from diabetes, immunosuppressive medications, or chronic illness
Sometimes the cause is purely mechanical. Significant weight loss or aging can reduce facial volume around the mouth, deepening the creases where saliva collects. If you wear braces, a CPAP mask, or anything that changes how your lips sit, that can contribute too.
How to Treat It at Home
The two goals are simple: kill the infection and keep the area dry. Most people improve noticeably within the first few days of consistent treatment, with full healing by about two weeks.
Apply an Over-the-Counter Antifungal
Since yeast is the most common culprit, an antifungal cream is your best first move. Look for 1% clotrimazole or 2% miconazole cream at the pharmacy (these are the same creams sold for athlete’s foot or yeast infections). Apply a thin layer to the corners of your mouth three times a day for two full weeks. Don’t stop early because it looks better. The infection can linger beneath healed-looking skin and come right back.
Use a Barrier to Block Moisture
After applying your antifungal, seal the area with a thick barrier like petroleum jelly or a zinc oxide cream. This serves two purposes: it locks the medication against the skin, and it physically blocks saliva from re-soaking the cracked tissue. Reapply the barrier before bed, since nighttime drooling is a major reason the corners stay wet. If you tend to sleep with your mouth open, this step alone can make a significant difference.
Stop Licking Your Lips
This is harder than it sounds. The cracked skin feels dry, so your instinct is to lick it. But saliva evaporates quickly and leaves the skin drier and more irritated than before, and it delivers exactly the moisture that yeast needs. The barrier cream helps break this habit by covering the area so you’re less aware of it.
When You Need Something Stronger
If the corners of your mouth are oozing yellow or honey-colored crust, bacteria are likely involved rather than (or in addition to) yeast. Bacterial angular cheilitis requires a prescription antibiotic ointment applied to the area, typically for one to two weeks. Your doctor or dentist can usually diagnose this with a quick visual exam.
In cases where the skin is intensely inflamed, red, and swollen, a low-potency topical steroid cream can calm the irritation while the antifungal or antibiotic does its work. This is applied two to three times daily for up to two weeks. Steroid creams shouldn’t be used on their own, though, because they suppress the local immune response and can actually make a fungal infection worse if nothing is fighting the yeast at the same time.
Nutritional Deficiencies That Keep It Coming Back
If your mouth corners crack repeatedly, your body may be short on specific nutrients that keep skin healthy. Iron deficiency is one of the most common links, especially in women with heavy periods or people on restricted diets. Low B12 is another frequent finding, particularly in vegans and older adults who absorb it less efficiently. Riboflavin (B2) and zinc deficiencies round out the usual list.
You don’t necessarily need supplements. Foods rich in iron (red meat, lentils, spinach), B12 (eggs, dairy, fortified cereals), B2 (almonds, mushrooms, salmon), and zinc (pumpkin seeds, chickpeas, beef) can often correct mild gaps. If the cracks keep returning despite treatment, though, a blood test can confirm whether a deficiency is driving the cycle.
Fix the Underlying Mechanical Problem
Treating the infection without addressing why saliva pools there is like mopping the floor while the faucet runs. If you wear dentures, getting the fit adjusted can eliminate the deep lip creases that trap moisture. If you mouth-breathe at night, managing that (whether through nasal strips, allergy treatment, or a sleep evaluation) removes a major trigger.
People with naturally deep creases at the mouth corners sometimes benefit from dermal fillers, which restore volume and flatten the folds so moisture no longer collects. This is more relevant for recurring cases that resist all other treatment.
What the Healing Timeline Looks Like
With consistent treatment, most people notice the burning and cracking ease within two to four days. The redness fades over the first week. Complete healing, where the skin looks and feels normal, generally takes the full two weeks. If you see no improvement after a week of over-the-counter antifungal treatment, the infection may be bacterial rather than fungal, or there may be an underlying condition keeping the area from healing. That’s the point where a visit to your doctor or dentist makes sense, since a simple swap to the right topical medication usually resolves it quickly from there.
Recurrence is common. About half the battle is treating the active sore, and the other half is changing the conditions that caused it. Keep petroleum jelly on the corners of your mouth during cold or dry weather, address any nutritional gaps, and if you notice the earliest signs of cracking, start your antifungal again before it progresses.