My Grandfather was with the CCC in New Mexico as a teen during the depression. They lived in camps and worked on the parks all day, and at his camp they would have boxing matches, fighting on a platform of bare boards. He lean and tough and one of 8 boys out of 11 kids, so he was pretty good at throwing hands, but in one match tripped on an uneven board, fell on his face, and broke his jaw (according to him).
Before the CCC my grandfather grew up as a sharecropper, picking cotton from a very young age, in the bright sun, all day. And of course he was in the sun all day in New Mexico as well. When he was examined at the hospital a doctor saw that he had a great multitude of small skin cancers, and so he spent several weeks there recovering from the broken jaw with his jaw wired shut and having cancers removed. It probably saved his life, or at least gave him an extension.
He went on to fight in WWII, serving in France and the 3 borders region during he Battle of the Bulge, and died in 2021 about 1 month after his 100th birthday.
With skin cancer.