so... you are saying that if he hadn't moved away, he wouldn't have been white?
Yup, he would be tanned as hell. In response to the stimuli his skin would go overboard on melatonin production. To the point when even removed from the stimuli his skin would retain some of the tan unless they locked him in pitch black conditions. --- "W-whaaat... H-how?!" "...Nanomachines, Son!"