Sunburn causes redness and swelling. The burn effects do not show immediately but take two to six hours after the sunburn and peak within twenty-four hours. The effects of sunburn result in redness, swelling, pain, blisters and the skin may feel hot to touch. In severe cases the affected person develops fever. Some people get so sun burnt that they suffer from second-degree burns and may go into shock and even death. Dehydration and electrolyte imbalance is another result. Regular application of sunscreens can save you from so much trouble. Learn more about sunscreens here.