What characterizes frictional keratosis?

Frictional keratosis is characterized by being a reactive lesion that results from chronic irritation or trauma to the oral mucosa, commonly due to habits such as cheek biting or aggressive brushing. The condition presents itself as a white patch on the mucosa that develops as a protective response from the tissue by producing keratin, an important structural protein. This overproduction of keratin helps to shield the affected area from further injury.

In contrast, other options relate to different oral health issues or conditions. A type of gum disease would typically involve inflammation and infection of the periodontal tissues, which does not describe frictional keratosis. Similarly, a viral infection causing oral lesions would refer to conditions like Herpes Simplex, which are fundamentally different in etiology and presentation. Lastly, a benign tumor on the lip suggests a neoplastic process rather than a reactive one, which does not align with the characteristics of frictional keratosis. Therefore, the definition of this condition is closely linked to the response to continuous mechanical irritation, accurately described by the option regarding cheek biting.