Angular Cheilitis: Cracks at the Corners of Your Mouth

A split at the corner of your mouth can make a small bite or a yawn unexpectedly painful. If the same spot keeps cracking, it may be angular cheilitis, also called perleche or perlèche. It is not simply another name for a cold sore, and the right treatment depends on what is irritating the skin.

This guide explains what to look for, what you can try at home, and when a doctor or dentist should assess it. It is general information, not a diagnosis of a particular mouth sore.

What Is Angular Cheilitis?

Angular cheilitis means inflammation at the corners where the upper and lower lips meet. The skin can develop deep splits, crusting or shallow sores. Opening your mouth may reopen a crack and cause bleeding. HealthLink BC’s explanation of angular cheilitis describes these features and the different causes.

It can affect one corner or both. Redness may be less obvious on darker skin; the area can look lighter or have a darker rim instead. Painful splitting, damp-looking skin and changes from your usual appearance can be more useful clues than redness alone. DermNet describes how the appearance varies.

What Triggers the Cracks?

Saliva sitting in the folds at the mouth corners can irritate the skin. Licking may briefly feel soothing but keeps that exposure going. Dry lips, deeper skin folds and poorly fitting dentures can contribute. Yeast such as Candida or bacteria such as Staphylococcus can then be involved, sometimes together.

Other contributors include eczema, medicines that dry the lips, and conditions that affect immunity. A history of diabetes, recent antibiotics or oral thrush is worth mentioning during an assessment. These are possibilities to investigate, not conditions you can diagnose from a lip crack. The Primary Care Dermatology Society’s clinical guidance explains these overlapping factors.

Is It a Cold Sore?

Angular cheilitis: Splitting and irritation are concentrated at the mouth corners. It is generally considered non-contagious and is not itself a sexually transmitted infection.

Cold sores: These are caused by herpes simplex and are contagious. They need a different treatment approach. See our guide to cold sore treatment in Canada. Cleveland Clinic explains the distinction.

Canker sores: These form inside the mouth, rather than being cracks at the outer corners. Chapped lips: Dry weather can cause broader lip dryness and peeling. HealthLink BC compares common mouth problems.

Location alone does not settle the diagnosis: herpes can occasionally affect a mouth corner. Have a new or uncertain sore assessed, particularly if you are concerned about a recent sexual exposure. Do not assume every sore at this location is harmless or non-infectious.

What Can You Try at Home?

For mild irritation, focus on protecting the skin rather than cycling through medicated creams:

• Use a simple barrier. Plain petroleum jelly can protect the corners and reduce dryness.
• Avoid licking or picking. Try not to repeatedly disturb the split.
• Reduce irritation. Pause lip products that sting. Harsh mouthwashes, toothpaste or spicy foods may aggravate discomfort.
• Try a cool compress. This may ease soreness while the underlying cause is addressed.

Cleveland Clinic’s self-care guidance covers protection and avoiding irritants. Petroleum jelly is a barrier, not an antifungal or antibiotic; it will not address every cause.

What About Dentures?

Keep dentures clean and remove them overnight as directed by your dental team. If they move, rub or no longer fit comfortably, arrange a dental review. Repeatedly treating the skin without addressing the fit may leave the trigger in place. The Australasian College of Dermatologists highlights denture care and saliva protection.

Which Cream Is Right?

There is no single best cream for every cracked mouth corner. Treatment may involve an antifungal for yeast, an antibiotic for a bacterial infection, or a clinician-directed combination. Oral thrush, if present, also needs attention. The Canadian Dental Association’s clinical article emphasizes checking local causes and treating associated infection.

A steroid may sometimes be included for significant inflammation, but do not assume that hydrocortisone alone treats the cause. Ask a pharmacist or clinician before using a medicated product near the mouth, especially for a child. Check where to apply it, how long to use it and when to seek review. Do not substitute cold-sore cream simply because the area is on your lip.

Could It Be Low Iron?

Iron, vitamin B12, riboflavin and other nutritional deficiencies can contribute, but a crack is not proof that you need supplements. The dermatologists’ guidance on underlying causes includes nutritional problems alongside local irritation and other medical conditions.

If cracks keep returning, discuss your diet, existing conditions and any other symptoms. Testing and treatment should follow that assessment. Do not jump from a mouth sore to high-dose vitamins or iron treatment without establishing whether a deficiency exists.

How Long Does It Last?

Some mild cases settle on their own. With appropriate treatment, improvement often begins within a few days and healing commonly takes around two weeks. There is no reliable overnight cure. Recurrence is common when the underlying trigger remains. DermNet gives these usual recovery expectations.

If it is not improving, is still present around two weeks, or repeatedly returns, arrange review rather than indefinitely reapplying the same cream.

When to Get Medical Help

Seek prompt care for worsening pain, spreading redness or swelling, pus, fever, or difficulty drinking enough. Get advice earlier if you have diabetes or a weakened immune system. Call 911 for trouble breathing or rapidly increasing tongue or throat swelling. These are not symptoms to wait out as routine lip irritation. HealthLink BC’s mouth-symptom guidance explains when care is needed.

In BC, you can also call 8-1-1 for health advice if you are unsure where to seek care.

Prepare for Your Visit

Note when the cracks began, whether one or both corners are affected, and which products you have tried. Bring your medication list and mention denture fit, lip licking, dry mouth or symptoms elsewhere in the mouth. An assessment may include an examination and, when indicated, a swab or blood tests; not everyone needs testing. The Canadian Dental Association outlines what clinicians investigate.

Walk In connects eligible patients in selected Metro Vancouver communities with physicians for phone or video appointments. A physician can discuss symptoms and appropriate next steps; some concerns need an in-person examination or dental care. Review virtual care eligibility and services and our appointment preparation guide. A prescription or specific treatment is not guaranteed.

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