[The occurrence of squamous-cell skin cancer in psoriasis patients].

Basing on literature data, the author analyzes the conditions that may be conducive to the development of squamous-cell carcinoma of the skin in patients suffering from psoriasis. Five cases of squamous-cell carcinoma of the skin in psoriasis patients were observed by the author. A poor prognosis is most frequently explained by late diagnosis of the tumor process. The author emphasizes the necessity of timely cytologic and histologic studies in differential diagnosis of skin tumors in psoriasis patients.