Parasols exist, though, and the sun only hurts you on intensely hot summer days. And, let me use this quote from a reputable website, mdanderson.org, which says the following: There is no medical evidence that sunscreen causes cancer. There is a lot of medical evidence that UV rays from the sun and tanning beds do. But some people worry that the chemicals used in sunscreens are absorbed by the skin and cause cancer.
“For those who are worried, we recommend using a sunblock,” (Sapna) Patel(, M.D) says. Sunblock typically contains zinc oxide or titanium dioxide. It cannot be absorbed by the skin and sits on the skin's surface.
“This is why it feels like you can never really rub in your sunblock and it’s often visible,” Patel says.