Abstract
Lichen planus refers to dermatoses with frequent, often isolated, lesions of the oral mucosa. In the presence of rashes only on the oral mucosa, the diagnosis is difficult. At the same time, erosive-ulcerative forms of the disease present the greatest differential diagnostic difficulties. Cases that do not heal for a long time and are not amenable to treatment should be especially alert to the doctor due to the risk of malignancy.
 The article describes a rare clinical case of squamous cell carcinoma of the oral mucosa in a 52-year-old patient with an erosive-ulcerative form of lichen planus of the oral cavity, characterized by a chronic long-term course, torpidity to therapy and simultaneous damage to the genital mucosa. The presented case emphasizes the importance of a thorough clinical examination, with a histological examination of the biopsy in order to monitor changes in the lesions.
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