Squamous cell carcinoma can arise from-a) Long standing venous ulcersb) Chronic lupus vulgarisc) Rodent ulcerd) All of the above

• It is a carcinoma of the cells of epidermis that usually migrate outwards to the surface. • Originate from prickle cell layer; Seen in > 40 years of age • MC skin cancer in darkly pigmented races • 2nd MC skin cancer in light skinned races • MC causative factor: Sunlight • MC site: Ears, cheeks, lower lip and back of hands