Looks like the author of this blog is a well qualified - working on a master's degree in acupuncture.

I live in one of the most sun exposed areas of the world (Texas gulfcoast). I get plenty of vitamin D from sunlight. I got some severe sunburns on my upper body when I was in high school (stupid forays at the beach without any sunscreen). Guess where my melanoma showed up? Not the dark unexposed areas of the body implied by the author. I got melanoma on the very exposed right upper side of my chest. Fortunately, my wife saw it early and I went to the dermatologist immediately. Extensive surgery got it all, since it was so early.

I'll keep using my sunscreen and leave the prognostication to the inexperienced and unqualified.

Bob