Predisposing factors for skin ca are – a) Lichen planusb) Bowen's diseasec) Psoriasisd) Bechet's diseasee) UV rays: (A) abc, (B) bcd, (C) abe, (D) acd
Answer is C. Hypertrophic lichen planus and Bowen's disease are premalignant conditions of SCC of skin.
UV rays is the most important predisposing factor for SCC of skin.