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Kissing Lesion (Oral Candidiasis)

What is Kissing Lesion (Oral Candidiasis)?

Oral candidiasis, commonly called a “kissing lesion,” is a superficial fungal infection of the mouth caused by over‑growth of Candida species—most often Candida albicans. The term “kissing lesion” describes a pair of white, slightly raised patches that appear on opposite surfaces of the oral cavity and “kiss” each other when the lips, tongue, or palate touch (for example, a patch on the inner cheek opposite a similar patch on the tongue). These lesions are usually painless, but they can become painful, bleed, or develop a burning sensation if left untreated.

The infection thrives in warm, moist environments and can affect anyone, but it is especially common in people with weakened immune systems, altered oral flora, or those who wear dentures.

Common Causes

Many factors can disrupt the balance of normal oral microorganisms and allow Candida to proliferate.

• Antibiotic use – Broad‑spectrum antibiotics (e.g., amoxicillin, clindamycin) kill beneficial bacteria that normally keep yeast in check.
• Inhaled corticosteroids – Asthma or COPD inhalers (fluticasone, budesonide) can deposit steroids in the mouth, suppressing local immunity.
• Immunosuppression – HIV/AIDS, chemotherapy, organ transplantation, or chronic steroid therapy.
• Diabetes mellitus – High blood sugar creates a nutrient‑rich environment for yeast.
• Denture wear – Poorly fitting or inadequately cleaned dentures provide a niche for fungal growth.
• Dry mouth (xerostomia) – Saliva normally contains antifungal proteins; reduced flow (from Sjögren’s, meds, radiation) predisposes to candidiasis.
• Smoking and alcohol – Irritate oral mucosa and alter microbial balance.
• Nutrition deficiencies – Low iron, vitamin B12, or folate can impair mucosal immunity.
• Hormonal changes – Pregnancy or hormonal contraceptives may increase susceptibility.
• Oral trauma – Sharp teeth, braces, or recent dental work can create entry points for the fungus.

Associated Symptoms

While some people notice only the characteristic white patches, oral candidiasis often presents with additional symptoms:

• Burning or tingling sensation, especially on the tongue or palate.
• Redness or inflamed margins surrounding the white lesions.
• Soreness that worsens when eating spicy, acidic, or salty foods.
• Difficulty swallowing (dysphagia) if the infection spreads to the throat.
• Loss of taste or a metallic taste in the mouth.
• Cracking at the corners of the mouth (angular cheilitis) – another form of Candida infection.
• Unexplained weight loss or fatigue if the infection is extensive.

When to See a Doctor

Most mild cases resolve with simple antifungal mouth rinses, but you should seek professional care if you notice:

• Lesions that persist longer than 2 weeks despite over‑the‑counter treatment.
• Significant pain, bleeding, or difficulty swallowing.
• Fever, chills, or a general feeling of being unwell.
• Recurrent episodes (more than 3–4 times a year).
• Underlying conditions such as uncontrolled diabetes, HIV, or a recent cancer diagnosis.
• New or worsening lesions while taking inhaled steroids or antibiotics.

Diagnosis

Healthcare providers use a combination of visual examination and laboratory tests to confirm oral candidiasis.

Clinical examination

• Inspection of the oral cavity for classic white plaques that can be scraped off, revealing a reddened, sometimes bleeding base.
• Assessment of denture fit, salivary flow, and any oral trauma.

Laboratory tests (when needed)

• Microscopic smear – A swab of the lesion stained with potassium hydroxide (KOH) shows budding yeast and pseudo‑hyphae.
• Culture – Grows Candida on Sabouraud agar to identify species and guide antifungal choice.
• Blood glucose test – Screens for undiagnosed diabetes.
• HIV screening – Recommended for patients with recurrent or severe oral candidiasis without an obvious cause.

Treatment Options

Treatment aims to eradicate the yeast, relieve symptoms, and address underlying risk factors.

Topical antifungals (first‑line for mild‑moderate disease)

• Nystatin suspension – 100,000 IU/mL; swish 5 mL for 2 minutes, then swallow; 4‑6 times daily for 7‑14 days.
• Clotrimazole troches – Dissolve one lozenge (10 mg) slowly in the mouth, 5 times daily.
• Miconazole oral gel – Apply a thin layer to affected areas, 5 times daily.

Systemic antifungals (for extensive disease, denture‑related cases, or immunocompromised patients)

• Fluconazole – 100 mg PO once daily for 7–14 days; alternative for patients who cannot tolerate topical agents.
• Itraconazole – 200 mg PO daily; useful for azole‑resistant strains.
• Voriconazole or Posaconazole – Reserved for severe or refractory infections.

Adjunctive measures

• Remove or disinfect dentures overnight; consider a professional fit if they are loose.
• Rinse mouth with saline or chlorhexidine (0.12%) after meals to reduce microbial load.
• Limit sugar and refined carbohydrates, which feed yeast.
• Increase fluid intake to promote salivation.
• For inhaled steroid users – rinse mouth with water and spit after each puff; use a spacer device.

Prevention Tips

Most cases can be avoided by maintaining a healthy oral environment and managing risk factors.

• Good oral hygiene – Brush twice daily with fluoride toothpaste, floss daily, and replace toothbrushes weekly.
• Proper denture care – Clean daily with a denture brush, soak in an antimicrobial solution, and store in water when not worn.
• Control blood sugar – Aim for HbA1c < 7 % if you have diabetes.
• Use inhaled steroids correctly – Employ a spacer, rinse mouth after each use, and keep the dose as low as possible.
• Avoid smoking and excessive alcohol – Both reduce salivary flow and irritate mucosa.
• Stay hydrated – Sip water throughout the day; sugar‑free chewing gum can stimulate saliva.
• Limit antibiotics to when they’re truly needed – Discuss risks with your prescriber.
• Regular dental visits – Professional cleanings and early detection of oral changes.
• Nutrition – Adequate intake of iron, vitamin B12, and folate supports mucosal immunity.

Emergency Warning Signs

Key Take‑aways

• Kissing lesions are a visual hallmark of oral candidiasis, caused by over‑growth of Candida yeast.
• Common triggers include antibiotics, inhaled steroids, dentures, diabetes, and immune suppression.
• Most cases are mild and respond to topical antifungals, but persistent or severe disease requires systemic therapy and evaluation for underlying conditions.
• Good oral hygiene, proper denture care, and managing systemic risk factors are the best preventive strategies.
• Seek medical care promptly if lesions persist, cause significant pain, or are accompanied by fever or breathing difficulty.

References:

1. Mayo Clinic. Oral thrush (thrush). https://www.mayoclinic.org
2. CDC. Candidiasis – Oral Thrush. https://www.cdc.gov
3. National Institutes of Health, National Institute of Allergy and Infectious Diseases. Candida infections. https://www.niaid.nih.gov
4. WHO. Oral health: a window to overall health. 2022. https://www.who.int
5. Cleveland Clinic. Oral Thrush: Symptoms, Causes, Diagnosis, Treatment. https://my.clevelandclinic.org

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