Which statement best describes leukoplakia?

• A. A white patch on mucosa that can be rubbed off easily.
• B. A red patch on mucosa indicating inflammation.
• C. A pigmented lesion of mucosa.
• D. A white patch on mucosa that cannot be rubbed off and is premalignant.

Answer: (D)

Leukoplakia is a white patch on the oral mucosa that cannot be rubbed off and cannot be attributed to another condition. The key idea is its non-removability by scraping, which distinguishes it from lesions like candidiasis or frictional keratosis that can be wiped away. It’s considered premalignant because a portion of these patches may harbor dysplasia and potentially transform into squamous cell carcinoma, so a biopsy is often needed to assess risk and guide monitoring or treatment. The other descriptions describe conditions that are either removable by rubbing (which would not be leukoplakia), red patches (erythroplakia or inflammation), or pigmented lesions, none of which fit this white, non-removable, premalignant pattern.