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It is purple and blue because by the air pollution where you live and sleep they were contaminated and now every time you go to sleep when you breathe it becomes more blue and purple and that the pollution increases skin is ignited that pollution continues to increase has wings to survive and fly to the sky so that their skin color does not continue to increase and does not die because you need to fly as high as you can because the air is not polluted there and that makes your skin color drop to a lower level and you can live longer to live.