Cracked Corner of Mouth: Causes and Treatment

Cracked corners of mouth.
Foto: CCO/ Unsplash/ Melissa Di Rocco

Find out what causes cracked corners of the mouth, what symptoms to expect, and how to manage this common complaint by reading more about it.

Cracked corners of the mouth can cause irritation, pain, and even lead to infection or more serious conditions. It is most common among the very young and the very old, but it can happen to anyone – though some are more prone to developing it than others.

Usually, cracked corners of the mouth can be easily treated at home. Sometimes, medical advice and intervention may be required. We’ll take a closer look at the condition, its causes, symptoms, and management, as well as the more severe condition that can develop from cracked corners of the mouth.

Cracked Corners of the Mouth

You may need to seek medical advice.
You may need to seek medical advice. (Foto: CC0 / Pixabay / jarmoluk)

Cracked corners of the mouth are usually caused by saliva — which tends to gather here and causes dryness. This can cause the folds of the skin at the corners of the mouth to become dry, itchy, and irritated.  Very dry skin can crack, bleed, or develop into angular cheilitis — an inflammatory and painful condition that is sometimes confused for cold sores.

Sometimes bacteria or fungi get into the cracks, which can cause this more serious inflammation or infection. Angular cheilitis occurs in 0.7 percent of the American population and is the most common bacterial/fungal infection of the lips.

You should seek medical advice if you are concerned about cracked corners of the mouth, if the condition doesn’t respond to simple treatments, or if symptoms are severe. You may need a topical corticosteroid to decrease inflammation and/or an antimicrobial cream to treat any infection that might be present. If you have a mild case of cracked corners of the mouth, a DIY treatment should be enough for you.

Causes of Cracked Corners of the Mouth

Saliva exposure is the most common cause of cracked corners of the mouth.
Saliva exposure is the most common cause of cracked corners of the mouth. (Foto: CCO/ Unsplash/ Joey Nicotra)

Exposure to saliva is the primary cause of cracked corners of the mouth. This is because the digestive enzymes present in saliva (amylase and lipase) can actually break down body tissue if prolonged contact persists. The inside of the mouth has a protective barrier to prevent this, but the lips and corners of the mouth do not. Exposure to extreme hot and cold may also contribute to the development of cracked corners of the mouth.

The most common causes for saliva to pool in the corners of the mouth include:

  • The normal loss of skin turgor due to aging, smoking, or rapid weight loss
  • Stroke with facial asymmetry
  • Ill-fitting dentures or loss/erosion of teeth that cause an overhang of the upper lip onto the lower one
  • Deepened furrowing of the skin
  • Conditions associated with enlarged lips
  • Down syndrome
  • Nasal congestion causes mouth breathing and potentially drooling — particularly during sleep

Nutritional deficiencies, particularly vitamin B compounds, protein, iron, and zinc, may also contribute to the development of cracked corners of the mouth and angular cheilitis. So it might be prolonged exposure to food or oral hygiene products that irritate the skin. Other causes are believed to include chronic health conditions like diabetes or inflammatory bowel disease, and immune system disorders, like HIV. Dry mouth and cancer treatment can also cause the conditions.

Symptoms include:

  • Dry cracks at the corner of the mouth
  • Pain — particularly when moving the mouth, speaking, or eating
  • Sensitivity to food and drink
  • Burning sensation or increased sensitivity in the corner of the mouth
  • Dry skin in the surrounding area
  • Redness and inflammation in the corner of the mouth
  • Crusts, whitening, and thickening in the corner of the mouth

Symptoms of angular cheilitis are associated with more severe inflammation and microbial infection. They can include:

  • Oral yeast infection caused by the yeast candida
  • Redness resembling eczema or dermatitis on the corners of the mouth, lips, or lower face
  • Deep cracks (fissures) developing at the corner of the mouth
  • Blisters and lesions

Treating Cracked Corners of the Mouth

Moisture is important to prevent cracks in the corner of the mouth.
Moisture is important to prevent cracks in the corner of the mouth. (Foto: CC0 / Pixabay / silviarita)

Washing is the first-line treatment for cracked corners of the mouth, as keeping the area clean can prevent chaps and cracks from becoming colonized and infected. Cracks are usually tender, therefore, choosing a gentle and natural product is important. We recommend a natural soap, like castile soap, which is sensitive-skin friendly.

Exfoliating skin naturally at home is something many of us do, but we don’t always remember the lips and corners of the mouth. It is important to remove dead skin cells around the cracks to allow the healthy layer beneath to regenerate. You can easily make a homemade sugar lip scrub using an oil base, like coconut or olive oil, and salt or sugar. Simply mix a few drops of your chosen oil with half a teaspoon of salt or sugar granules to make a paste and gently apply to the corners of the mouth. Rub gently in a circular motion and rinse before patting the area dry.

When you dry the corners of the mouth, apply a moisturizing lip balm. You can learn how to make homemade lip balm with our easy recipe for chapstick. Continue to use it after you have healed cracks in the corner of your mouth to help prevent a recurrence. Alternatively, use a gentle product like all-natural homemade lotion.

More Natural Remedies

Coconut oil is a natural moisturizer.
Coconut oil is a natural moisturizer. (Foto: CC0 Public Domain / Unsplash / owfiqu barbhuiya)

Coconut oil is a natural moisturizer and it also contains lauric acid – a strong antibacterial, antiviral and anti-inflammatory agent — that may help to prevent angular cheilitis. It provides moisture thanks to its fatty base and emollient properties. Coconut oil has been shown to exhibit benefits on skin barrier function and regeneration, making it an ideal home remedy for cracked corners of your mouth.

Green tea might also help heal the cracked corners of your mouth. The evidence suggests that the compounds it contains may have many biological functions — including antioxidant and anti-inflammatory properties that can ease sore, dry, and inflamed corners of your mouth. These compounds are all affected by heat, so dab lukewarm green tea onto your lips for maximum effects.

If your symptoms do not resolve within 2-3 days, you may need to seek medical advice. Some cracks in the corners of the mouth and angular cheilitis will require antimicrobial or antifungal treatments — or even a dermatology review. If your symptoms are related to dentures or dental issues, we recommend making an appointment with your dentist.

Preventing Cracks in the Corner of the Mouth

Dental hygiene plays an important role in healthy lips and mouth.
Dental hygiene plays an important role in healthy lips and mouth. (Foto: CC0 / Pixabay / klimkin)

Cracked corners of the mouth might happen once in a lifetime, or you may be prone to the condition. Regular dental check-ups and regular skincare will help to prevent a recurrence. In order to prevent this condition, use the following tips:

  • Eat a balanced and healthy diet
  • Keep your lips moisturized through regular application of natural lip balms
  • Stay hydrated – consider using electrolyte drinks
  • Don’t like your lips
  • Stay away from cigarettes and other forms of smoking
  • Use natural cosmetics and zero-waste makeup to avoid skin allergens and irritants
  • Regularly use DIY mouthwash made from natural ingredients

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