Hyperkeratosis: White rough epithelial thickening of left buccal mucosa.

Hyperkeratosis: Microscopic image showing thick layer of orthokeratin on the surface.

Hyperkeratosis: Low-power microscopic image showing thick layer of keratin on the surface.

Hyperkeratosis: White epithelial thickening of lower labial mucosa due to placement of smokeless tobacco.

Hyperkeratosis. A rough white asymptomatic patch which does not rub off is located on the mandibular left gingiva and alveolar mucosa.