A sunburn is a radiation burn to the skin produced usually by overexposure to the ultraviolet (UV) radiation from the sun. A similar burn can be produced by overexposure from other sources of UV, such as tanning lamps and welding arcs.
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Minor sunburns typically cause nothing more harmful than a slight redness and perhaps tenderness to the affected area, though skin damage that is invisible to the naked eye remains even after the burn has healed. Furthermore, this damage is cumulative, so it is best to avoid getting even a minor sunburn. In more serious cases blistering can occur. Extreme sunburns can be quite debilitating as well as producing a lifelong increase in one's susceptibility to skin cancer, in particular melanoma.
In recent years, the incidence and severity of sunburn has increased worldwide, especially in the southern hemisphere, because of damage to the ozone layer caused by air pollution. Another component of the modern world that increases the danger of UV exposure is the fact that some pharmaceuticals can cause a person to be much more sensitive to UV. Among the drugs that can have this effect are common antibiotics, contraceptives, and tranquillizers.
When you are exposed to any artificial source of UV, special protection should be worn. To protect yourself from the natural UV of the sun, one should wear long sleeves and hats or use an umbrella. It is also good to avoid prolonged outdoor activities during peak hours of UV exposure -- approximately from 10 a.m. to 3 p.m., if possible. Commercial preparations are available that block UV. These sunblocks have a sun protection factor (SPF) rating. Dermatologists suggest that you buy one that has an SPF of 15 or more and that you follow the directions regarding how often to reapply carefully.
It has been noted recently that many Australians are suffering from Vitamin D deficiencies, caused by lack of exposure to sunlight. This can be attributed to a low-level paranoia about exposure to the sun. Some exposure is necessary for health, but as with all things, in moderation.The effects of a sunburn
The worsening danger
Ways to protect yourself from sunburn
