Predisposing factors for skin cancer are-a) Smokingb) U-V-light c) Chronic ulcerd) Infrared light

Exposure to Sun (UV rays) Major predisposing factors.                    o Old burn scars Industrial carcinogens (Tars and oils)                                                    o Ingestion of arsenicals Chronic ulcers and draining osteomyelitis.                                           o Ionizing radiation Note : Cigarette smoking and tobacco & betel nut chewing are predisposing factors for squamous cell carcinoma of lips and oral cavity.