Sun exposure is not necessarily dangerous if you make the proper precautions, but the facts need to be clear on both the benefits of some exposure to the sun and the UV rays’ harmful effects. The most obvious and immediate danger of too much UV exposure is sunburn. By looking at sunburned skin under a microscope, the damage is clearly apparent. With repeated sun damage, the skin starts to look dry, wrinkled, and leathery. However, the sun's most serious threat is the development of skin cancer, which has now become the most common of all cancers. The vast majority of dermatologists agree that most skin cancers can be avoided by preventing sun damage.