Sun damage is a very common skin disorder that is caused by overexposure to sun. Harmful UV rays can damage your skin, causing sunburn, wrinkles, premature aging, dark spots, reduced skin elasticity, and issues with skin tone. Most importantly, it can lead to skin cancer. The most important thing to remember is to always use products with an SPF to prevent further damage. There are also a variety of treatments that can be used to reverse the signs of sun damage.