Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Skin Cancer ?
    ### Response:
    Squamous cell carcinoma develops in the squamous cells of the epidermis, the outer layer of the skin. It is much less common than basal cell carcinoma and is rarely life-threatening. Squamous cell carcinoma occurs most often on parts of the body that have been exposed to the sun, such as the face, ears, neck, hands and legs.
    