It's just irridescence, and is very normal especially in snakes that have just shed. If you look at Brazilian Rainbow Boas, they have a very large amount of irridescent coloration. I have some pictures of the Ball Pythons, boa and corn snakes if you want to see. Very pretty boy you have there

He doesn't look like he's shedding. Is he dark, have a pink belly, eyes bluish? How is his enclosure set up(temps, humidity, how many hides, what size enclosure and what type of enclosure, etc) and what are you offering him as prey and when?