Sunburn is the most obvious sign that you've been sitting outside for too long. But sun damage isn't always visible. Under the surface, ultraviolet light can alter your DNA, prematurely aging your skin. Over time, DNA damage can contribute to skin cancers, including deadly melanoma.

WHEN TO SEE A DOCTOR? Call for a doctor's help if you notice any of these more serious sunburn signs,Fever of 102 degrees or higher, Chills, Severe pain, Sunburn blisters that cover 20% or more of your body, Dry mouth, thirst, reduced urination, dizziness, and fatigue, which are signs of dehydration