Leukoplakia is defined as which of the following?

• A. Red patch in oral mucosa
• B. White plaque that cannot be rubbed off
• C. A non-infectious itchy rash
• D. White plaque which does not rub off and cannot be clinically identified

Answer: (D)

Leukoplakia is identified by a white patch or plaque on the oral mucosa that cannot be rubbed off with gentle scraping and cannot be attributed to any other specific disease based on clinical appearance alone. This non-removable white patch signals that the lesion requires further assessment, often including biopsy, to rule out or detect dysplasia or malignancy. The key features are the persistence of a white area that cannot be wiped away and the lack of a definite clinical diagnosis from appearance alone. This explains why the best choice describes a white plaque that does not rub off and cannot be clinically identified as another condition.