Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Squamous cell carcinoma ?
    ### Response:
    Squamous cell carcinoma (SCC) is the second most common skin cancer. SCC most often affects individuals who are exposed to large amounts of sunlight. It is typically characterized by a red papule or plaque with a scaly or crusted surface; it may be suspected whenever a small, firm reddish-colored skin lesion, growth or bump appears on the skin, but it may also be a flat growth with a curly and crusted surface.
    