Three years ago, at age 17, I was diagnosed with melanoma. As I learned, cancer is tough, especially for teens, who often think they are immune to it.

For teens, a cancer diagnosis isn’t expected at all. Most teens think that they aren’t susceptible to any type of cancer. As parents and adults, the best thing we can do is educate young people about the dangers of cancer, and how every little thing -- sunburns, not using sunscreen...