To decide the best course of treatment for you, your care team needs to know as much as they can about your cancer. This may involve getting some tests and working with more than one doctor. Depending on you and your melanoma, possibilities may include blood tests, imaging studies (like X-rays, CT scans, or MRIs), and further surgical sampling of your skin or lymph nodes. And you may decide that you want to get a second opinion to help you choose a treatment.