Angular Cheilitis: Causes and Evidence-Based Management

Angular cheilitis is an inflammatory lesion of the labial commissures that presents with erythema, fissuring and crusting at the corners of the mouth. It is one of the most common conditions encountered in general dental practice, yet it is frequently treated as a simple fungal infection and allo...

Angular cheilitis is an inflammatory lesion of the labial commissures that presents with erythema, fissuring and crusting at the corners of the mouth. It is one of the most common conditions encountered in general dental practice, yet it is frequently treated as a simple fungal infection and allowed to recur. Most cases are multifactorial, and lasting resolution depends on identifying and correcting every contributing factor, from Candida colonisation to an ill-fitting denture or an undiagnosed nutritional deficiency.

Clinical Features

Presentation

The classic lesion is a well-defined area of erythema, oedema and fissuring at one or both commissures, often with adherent crusts and radial fissures that bleed when the mouth is opened widely. Symptoms range from mild soreness to significant pain on eating, speaking or yawning, and longstanding lesions may be entirely asymptomatic.

Bilateral involvement is considerably more common than unilateral involvement, and bilateral disease should prompt a search for a systemic or nutritional contribution.

Differential Diagnosis

Herpes labialis produces grouped vesicles and is typically unilateral, and it should be excluded when the presentation is vesicular rather than fissured. Actinic cheilitis, contact dermatitis, exfoliative cheilitis and, most importantly, squamous cell carcinoma may all mimic angular cheilitis.

Any lesion that persists for more than four weeks despite appropriate treatment should be biopsied. Unilateral, indurated or non-healing lesions carry the greatest risk of malignancy and warrant urgent referral.

Aetiology

Microbial Factors

Ohman and colleagues, reporting in the Journal of Oral Pathology in 1986, isolated Candida species from the commissures of 76 per cent of patients with angular cheilitis and Staphylococcus aureus from 60 per cent, with both organisms recovered together in a substantial proportion of cases. Candida albicans is the species most frequently identified, although other Candida species are also reported.

A review published in Dermatologic Therapy in 2011 confirmed Candida as the dominant organism and noted that bacterial co-infection is present in the majority of chronic lesions. This mixed microbiology explains why antifungal therapy alone frequently fails and why combined antimicrobial treatment is more effective.

Nutritional Deficiency

Deficiencies of riboflavin, vitamin B12, folate and iron are classic associations, and a study reported in the British Dental Journal in 2013 found that approximately 20 per cent of patients with recurrent angular cheilitis had low serum ferritin or low vitamin B12. Replacement therapy produced resolution in most of those patients.

Zinc deficiency has also been implicated, particularly in patients with poor dietary intake or malabsorption. Screening is inexpensive and should be undertaken in any patient with recurrent lesions rather than repeated courses of topical agents.

Mechanical and Anatomical Factors

Loss of posterior teeth and the resulting reduction in lower facial height shorten the vertical dimension and deepen the commissural folds. In this folded, moist environment, saliva pools and provides an ideal culture medium for Candida and staphylococci.

Ill-fitting removable dentures compound the problem by perpetuating reduced vertical dimension and by harbouring microorganisms on their fitting surfaces. Deep commissural folds in older patients, and lip-licking or digit-sucking habits in younger patients, produce the same effect.

Systemic and Immune Factors

Diabetes mellitus, human immunodeficiency virus infection, Down syndrome and inflammatory bowel disease are all recognised associations, and a study in Oral Diseases in 2012 reported a higher prevalence of commissural lesions in patients with poorly controlled diabetes. Xerostomia from medication or radiotherapy removes the protective film of saliva and increases susceptibility.

Immunosuppressive therapy, chemotherapy and nutritional compromise in eating disorders should also be considered. In these groups, angular cheilitis may be the presenting sign of an underlying systemic illness.

Diagnosis

Clinical Assessment

Diagnosis is largely clinical, and the history should record the duration, recurrence pattern, denture wear, dietary intake and any history of diabetes or immunosuppression. Examination should include the commissures, the oral mucosa, the tongue and the fitting surfaces of any prosthesis.

Microbiological and Laboratory Testing

Swabs for fungal culture and bacterial sensitivity are useful in recurrent or refractory cases, and a full blood count, serum ferritin, vitamin B12, folate and fasting glucose should be requested where a systemic cause is suspected.

Patch testing is valuable when contact allergy to lip cosmetics, toothpaste flavours or denture materials is suspected. A biopsy is mandatory for any unilateral, indurated or non-healing lesion.

Evidence-Based Management

Antimicrobial Therapy

Topical antifungal agents such as nystatin, clotrimazole and miconazole are the mainstay of treatment, and combination with an antibacterial agent improves outcomes in mixed infection. A randomised controlled trial reported in the Journal of Oral Pathology and Medicine in 2008 found that miconazole combined with hydrocortisone, applied twice daily, resolved 85 per cent of lesions within two weeks compared with 60 per cent for an antifungal agent alone.

Therapy should continue for two to four weeks, and for at least one week after clinical resolution, because shorter courses are associated with early relapse. Systemic antifungals are reserved for refractory cases or where topical access is poor.

Nutritional Correction

Where a deficiency is confirmed, targeted replacement is curative. Reports in the British Dental Journal have described complete resolution within eight weeks of iron or vitamin B12 replacement in patients whose lesions had failed repeated topical therapy.

Correction of Local Factors

Definitive treatment requires correction of the local environment. Dentures should be assessed for fit, vertical dimension and occlusal balance, then adjusted or remade as required, and patients should remove them at night and decontaminate them daily.

Chlorhexidine mouthrinse and an emollient such as petrolatum applied to the commissures reduce microbial load and protect the fragile epithelium. Plaque control must be maintained gently, and a soft powered brush such as the BrushO helps patients clean effectively without traumatising sore commissures.

Refractory and Recurrent Cases

Recurrence is common, and a study in Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology in 2014 reported that approximately 25 per cent of patients experienced a further episode within six months. Recurrence should prompt reassessment of the underlying factors rather than simple repetition of the previous prescription.

Persistent failure to respond should raise the possibility of an unrecognised systemic condition, an occult malignancy or antifungal resistance, and referral for specialist assessment is appropriate.

Prevention

Prevention rests on maintaining a normal vertical dimension, well-fitting prostheses and good denture hygiene, together with correction of nutritional deficits. Lip protection with an emollient, avoidance of lip licking and adequate hydration reduce the mechanical and moisture-related triggers.

Conclusion

Angular cheilitis is a multifactorial condition in which Candida and Staphylococcus aureus colonisation, nutritional deficiency, reduced vertical dimension and systemic illness interact. Clinicians who treat only the visible lesion invite recurrence. Accurate diagnosis, combined antimicrobial therapy, nutritional correction and attention to the local environment produce resolution in the great majority of patients.