Ultraviolet light e UV light, especially UVB, flares SLE in most patients o It is unclear whether exposure to UV light can initiate the lupus but onset after a sunburn is not unusual o There is good evidence that exposure of skin to UV light alters the location and chemistry of dna as well as the availability of ro and rnp antigensUltraviolet light  UV light, especially UVB, flares SLE in most patients.  It is unclear whether exposure to UV light can initiate the lupus, but onset after a sunburn is not unusual.  There is good evidence that exposure of skin to UV light alters the location and chemistry of DNA as well as the availability of Ro and RNP antigens