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Skin cancer is a disease that develops when skin cells grow abnormally and form a mass or lesion on the skin. There are different types of skin cancer, but most cases are caused by exposure to ultraviolet (UV) radiation from the sun or tanning beds. Early detection and treatment of skin cancer are crucial, so it’s important to regularly check your skin for any unusual changes, such as new moles, sores that won’t heal, or changes in the size, shape, or color of existing moles. Protecting your skin from the sun and avoiding indoor tanning can help prevent skin cancer.