both hair and skin
have something called
Melanin
this gives the skin and the hairs its colour
but in skin there is
Melanocytes
those cells r responsible for making the skin
darker and they are present in the dermis
of the skin
those cells have sensory to sunlight
when sunlight reachs it they seceret more
melanin so the skin will apear darker
but as soon as the person well
stay in home and away from sun light
his skin will return to its original colour
but not all the time
some people r affeced by sunlight
so their skin will return but it will stay
darker than the original
so their feet well be white
and their hands r darker
don't be surpised,i'm a medicine collage student
in my first year
I'm looking forward to be a dentist someday
in addition I adore reading science books