In 2006, I didn’t have any of the typical signs of melanoma: just a small bump on the top of my head behind my hairline. After a biopsy determined it was cancerous, a surgical oncologist removed it, along with some adjacent lymph nodes on both sides of my neck. After that, I enjoyed three years of being cancer-free. I really thought I’d dodged a bullet, because the tumor was removed with clear margins and none of the nearby lymph nodes...