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skin cancer is a growth on the skin that occurs when cells grow abnormally. it occurs most commonly on areas of the skin that are exposed to the sun, like the neck, arms, and face. if the growth continues unchecked, it can spread to other parts of the body through the blood stream or lymphatic system. it is essential to address an abnormal growths or unusual moles on the skin as soon as they are detected to prevent a potentially life threatening form of cancer.