Everyone has heard that melanin is the body's defense against too much UV exposure. Once during a visit with my dermatologist I asked if there was a connect between having vitiligo and increased skin cancer, expecting her to say yes. Instead she reacted as if I had asked a complete non sequitur. I had to make explicit my chain of reasoning (vitiligo means areas with no melanin production, meaning more UV damage, meaning more chance of skin cancer) and she half-heartedly told me no, she had never heard of such a thing.
It seems like there should be an obvious connection, but apparently not. It made me question whether she was just incurious or if there really is that loose of a connection between UV and skin cancer. BTW I've had two patches of skin cancer removed by this doctor, both on my neck/shoulder area, which is not affected by my vitiligo.