Perleche is an inflammatory skin condition that causes cracked, irritated sores at one or both corners of the mouth. The name comes from the French word meaning “through licking,” a nod to one of its most common triggers. In medical settings, the condition is more often called angular cheilitis, though both terms describe the same thing.
What Perleche Looks and Feels Like
Perleche typically starts as a patch of dry, irritated, or cracked skin right at the corner of your mouth. In mild cases, it can feel like persistent chapping that won’t go away no matter how much lip balm you apply. If left untreated, it can progress into swollen, painful sores that may bleed when you open your mouth wide to eat, yawn, or talk.
The affected skin often looks red, raw, or scaly. Some people develop crusting or a whitish buildup at the corners of the lips. The condition can affect one side or both, and it tends to come and go, especially if the underlying cause isn’t addressed. Many people mistake it for a cold sore, but the two are quite different.
Perleche vs. Cold Sores
Cold sores and perleche can look similar at a glance, but they behave differently. Cold sores are caused by the herpes simplex virus and typically begin as an itchy or painful area that turns into one or more small blisters. Those blisters eventually weep, scab over, and heal. They can appear anywhere on or around the lips.
Perleche, by contrast, stays confined to the corners of the mouth. It doesn’t form fluid-filled blisters. Instead, the skin cracks, dries out, and becomes inflamed. The distinction matters because the treatments are completely different: antiviral medication for cold sores, antifungal or antibacterial treatment for perleche.
What Causes It
Perleche develops when moisture collects at the corners of the mouth and creates an environment where yeast or bacteria can thrive. The most common culprit is a type of yeast called Candida, the same fungus behind oral thrush and many vaginal yeast infections. Bacterial infections, particularly from staph bacteria, can also play a role. In many cases, both yeast and bacteria are present at the same time.
The condition isn’t simply an infection, though. It’s the result of a chain reaction: something causes saliva to pool at the mouth corners, the constant moisture breaks down the skin barrier, and then microorganisms move in. That initial “something” varies widely from person to person.
Physical and Environmental Triggers
Anything that traps moisture at the lip corners can set the stage. Habitual lip licking is one of the most common triggers, since saliva evaporates quickly and leaves the skin drier than before, prompting more licking in a frustrating cycle. Ill-fitting dentures are another major factor, especially if they cause the lips to fold inward and create deep creases where saliva collects. Reduced saliva flow (common in older adults due to medications, dehydration, or underlying conditions) paradoxically contributes too, because a dry mouth prompts more frequent licking. Prolonged mask wearing can also trap warmth and moisture against the skin.
Nutritional Deficiencies
Perleche can be a visible sign of a nutritional gap. Iron deficiency is one of the best-known links, but deficiencies in B vitamins, particularly riboflavin (B2), folate, and B12, can also weaken the skin at the mouth corners and make it more vulnerable to cracking and infection. Zinc deficiency has been implicated as well. If perleche keeps coming back despite treatment, a blood test to check for these deficiencies is a reasonable next step.
Other Risk Factors
People with diabetes, weakened immune systems, or inflammatory bowel disease face a higher risk. Hormonal changes during and after menopause can thin the oral tissue, reducing its ability to withstand irritation. One cross-sectional study of denture wearers found that male sex, loss of vertical bite dimension (when teeth or dentures don’t maintain the proper height between the upper and lower jaw), and poor saliva buffering capacity were all independent risk factors for angular cheilitis. Orthodontic braces and frequent drooling during sleep can also contribute.
How Perleche Is Treated
Treatment targets both the infection and the damaged skin barrier. The most common approach combines a topical antifungal cream with a mild steroid to reduce inflammation, plus an unflavored petroleum-based ointment like Aquaphor or Vaseline to protect the skin between applications. The antifungal handles the yeast, the steroid calms the redness and swelling, and the barrier ointment keeps moisture from re-accumulating in the creases.
Over-the-counter antifungal creams designed for athlete’s foot or yeast infections (containing ingredients like clotrimazole, terbinafine, or miconazole) work well for mild cases. For more stubborn infections, or when bacteria are involved, a healthcare provider may prescribe a combination cream or add an antibacterial component. Topical vitamin A has also been used to promote healing in cases that resist standard treatment.
Most cases improve within one to three weeks once the right treatment starts. The key is consistency: applying the antifungal and barrier ointment several times a day, keeping the area clean and dry, and resisting the urge to pick at or lick the cracked skin. If perleche doesn’t respond to topical treatment within a few weeks, the underlying cause (nutritional deficiency, poorly fitting dentures, an immune issue) likely needs to be addressed directly.
Preventing Recurrence
Perleche has a frustrating tendency to return, especially if the conditions that caused it haven’t changed. A few daily habits make a real difference.
Keeping your lips moisturized with a bland, unflavored lip balm is the simplest preventive step. Look for products containing ceramides, dimethicone, petrolatum, or shea butter. Avoid lip balms with fragrances, menthol, camphor, cinnamon, peppermint oil, or eucalyptus, all of which can irritate the skin and make things worse. If a balm stings or causes discomfort when you apply it, switch to something simpler.
If you tend to lick your lips, especially in dry or cold weather, applying balm the moment you feel the urge can help break the cycle. Staying well hydrated throughout the day supports saliva production and reduces the impulse to lick. In cold, windy conditions, covering your lower face with a scarf protects the lip corners from chapping. During sun exposure, a lip balm with SPF 30 or higher using a physical blocker like zinc oxide or titanium dioxide provides protection without the risk of allergic reactions that some chemical sunscreens carry.
For people who wear dentures, having them professionally adjusted so they fit snugly and maintain proper bite height is one of the most effective ways to prevent perleche from recurring. Applying a thin layer of petroleum jelly to the corners of the mouth before bed creates a protective barrier during sleep, when drooling or mouth breathing is most likely to cause moisture buildup.