<P> The WHO recommends that artificial UV exposure including tanning beds should be avoided as no safe dose has been established . When one is exposed to any artificial source of occupational UV, special protective clothing (for example, welding helmets / shields) should be worn . Such sources can produce UVC, an extremely carcinogenic wavelength of UV which ordinarily is not present in normal sunlight, having been filtered out by the atmosphere . </P> <P> The primary measure is avoiding further exposure to the sun . The best treatment for most sunburns is time . Most sunburns heal completely within a few weeks . </P> <P> The American Academy of Dermatology recommends the following for treatment of sunburn: </P> <Ul> <Li> For pain relief, take cool baths or showers frequently . </Li> <Li> Use soothing moisturizers that contain aloe vera or soy . Hydrocortisone creams that can be purchased over-the - counter can also be used on areas that are painful, however avoid creams that end in "caine" as these can be more irritating . </Li> <Li> Anti-inflammatory medications such as ibuprofen or aspirin can help with pain . </Li> <Li> Keep hydrated and drink extra water . </Li> <Li> Do not pop blisters on a sunburn . Instead, let them heal on their own . </Li> <Li> Protect sunburned skin with loose clothing when going outside to prevent further damage . </Li> </Ul>

Which one is the most common cause of sunburn