I was a real sun-worshipper growing up, so I spent a lot of time at the beach. Galveston Island is only an hour away from my hometown of Houston. And I was in a surfing club as a teenager that went all up and down the Texas coast. Back then, sunscreen wasn’t really a thing. So, I got a lot of bad sunburns.

That didn’t become an issue until my early 40s. I developed a little itchy spot on the crown of my head. The dermatologist...