dr. carrie peterson is an internist and contributor to "women's health" magazine. good morning. >> 34% of women, i'm not sure what the percentage is for men, but i'm sure it's probably just as high. we've been hearing about these dangers for so long, why are so many people still not using sunscre sunscreen? >> a lot of factors. if you think, if i work indoors, i'm not going to get unexposure. think about it. if you're driving, your left arm is at higher risk. >> or if you've got a sunroof. >> exactly. through the top of the car. some people think it causes acne. other people think it's already in their makeup. and for some people, certain chemicals can cause a little stinging. >> you say it's important to watch your body in a sense. >> absolutely. >> to monitor. especially when you see new moles on your skin. >> yeah. just as part of your routine, health care, check your moles. if you notice that they're changing at all, see a dermatologist. and if you're not sure, interestingly, women's health in their june ipad edition, you'll be able to upload a photo and see if