**why is black people’s skin on their palms and soles of the feet lighter than their skin **color ?
It’s not just black people. Look at the hands and feet of white people who have a tan.
The skin over the palms of your hands and soles of your feet is much thicker than normal skin, and the layer of dead epidermal cells is also thicker. This means that very little UV reaches the melanocytes, the cells in living skin tissue which produce melanin. No melanin = no tan.
Is it really how much UV reaches melanocytes?
Cause most people wear pants all day long with little to no UV exposure ever and black people don’t have white asses.
I’m English/Irish/German/Danish, and when I worked roofing I got a tan that let you see the exact line you see on black people. It’s universal.
I know that black people have black butts, but that doesn’t mean that they don’t tan, either. Ask your darker buddies if they had tan lines from football, track, baseball, or other uniforms.
Well, black people who wear pants on a regular basis usually have asses significantly lighter in color than their skin that is exposed to the sun.
Remember, for millions of years of evolution our ancestors presumably did NOT wear pants. Therefore, asses were programmed to have skin pigment. The bottoms of your feet, tending to be on the ground most of the time, have little need for UV protection. The palms of your hands, as noted, have thicker skin that most of your body (though not as thick as the soles of your feet) and in normal resting position don’t get that much sun, either. Come to think of it, despite my vampire-pale complexion and a fair number of sunburns I can’t recall ever sunburning to palms of my hands though I have certainly sunburned the backs of them.
FWIW, my mother used to tell me it was because G~d set them down on their hands and feet when he spray painted them. She wasn’t racist.
I think there are also fewer melanocytes in the palms/soles, but I’m not 100% on that.