Tucson Living means living with sunshine year round. That can be dangerous for your skin. Some people believe that the cooler weather in the winter decreases their risk for developing skin cancer. But protecting your skin from harmful UV rays is a year-round job. Doctor Bruce Porterfield, M.D. is an oncologist at Arizona Oncology in Green Valley. He says that in addition to those who are exposed to the sun, people who use tanning beds are also at risk for non-melanoma skin cancer. The most important form of protection to use is sun screen. It is advised that you should use at least an SPF 30 or higher sun screen and apply a liberal amount before heading outside. You should re-apply the sunscreen about every ninety minutes.