It is summer again and everyone will be going to the beach or just basking in the sun in an attempt to get some healthy color in his or her skin. The sun produces invisible ultraviolet radiation, which are called UVA, UVB and UVC rays. The UVB rays are responsible for giving us the golden tan we look for so much in the summer months. However, it is the UVA rays that are the ones responsible for burning the skin that can result in skin damage. Scientists are still studying what possible effects UVC rays might have on the skin. Even on cloudy or overcast days the sun can do its damage. Sunburn occurs when the amount of sun exposure (or other ultraviolet light source such as tanning booths) exceeds the ability of melanin, the body's protective pigment, to protect the skin sufficiently. By the time the skin starts to get red and be in pain the damage has already occurred. Sunburn pain is usually most severe between six and forty-eight hours after sun over-exposure. Wearing an adequate sunscreen can usually protect the skin from these harmful rays.