Board Review: Oral Mucosal Lesions

Overview / Definition Oral mucosal lesions refer to a diverse group of disorders that affect the mucous membranes of the oral cavity. These lesions can present as ulcers, plaques, nodules, or vesicles, and may result from a wide range of etiologies, including infections, autoimmune diseases, and malignancies. Epidemiology The prevalence of oral mucosal lesions varies by population and etiology. Common conditions include: Oral lichen planus (affecting 0.5-2% of the population) Oral candidiasis (more common in immunocompromised individuals) Herpes simplex virus infections (common in young adults) Squamous cell carcinoma (most common oral malignancy) Pathophysiology / Mechanism The pathophysiology of oral mucosal lesions is highly variable and depends on the specific condition. For example: Oral lichen planus: An autoimmune condition characterized by a lichenoid tissue reaction, leading to inflammatory infiltration and keratinocyte damage. Oral candidiasis: An overgrowth of Candida species, typically due to immunosuppression or antibiotic use. Herpes simplex virus: Latent virus reactivation leading to vesicular lesions, primarily due to stress or immunocompromised states. Clinical Presentation Oral mucosal lesions can manifest in various ways, including: Ulcers: Painful, well-defined lesions, often seen in aphthous stomatitis. White patches: Seen in conditions like leukoplakia and oral lichen planus. Vesicles: Characteristic of herpes simplex virus infections. Red lesions: Often associated with inflammatory conditions or malignancies. Diagnosis / Workup The diagnosis of oral mucosal lesions involves a thorough clinical history and examination, often supplemented by: Biopsy: Essential for confirming malignancy or specific inflammatory conditions. Cultures: Useful in identifying infectious agents, particularly in cases of candidiasis or herpes simplex. Serological tests: Helpful in autoimmune conditions. Treatment / Management Management strategies vary by diagnosis and