A 53-year-old man, a long time smoker, presents with a white patch 5x3 cm in size that looks like a plaque with blurry boundaries on the lateral surface of the tongue. Histology of the biopsy materialobtained from the affected area allowed diagnosing significant keratinization and thickening of the mucosal epithelium and acanthosis. Under the epithelium, in the connective tissue, there is a mild infiltration consisting of lymphocytes, macrophages, and plasma cells. What type of damage to the oral mucosa is observed in this case?