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Most people have pale palms which do not tan

Result of a quick look on the internet

Why do black people have white palm since all their bodies is black ?

Best Answer - Chosen by Voters
Simple: Because the skin of the palms always has very little melanocytes (pigment producing cells) so even the darkest of people may have pale palms.
Also, it might interest you to know that from person to person the number of melanocytes doesn't vary all that much. It's just the amount of melanin that they produce which varies a lot.

Why cant you get a tan on your palms?

Skin contains the pigment melanin which is activated by exposure to light. The palms of your hands and the soles of your feet have much thicker layers of skin due to their regular contact and friction with other objects (the ground, tools, etc).

Melanocytes exist in the dermal layers of your palms and soles, but are buried beneath the more callous layers and are rarely directed at the sun. You could in theory try to tan your hands but the results would be pretty minimal compared to the rest of your body.

The Naked Woman: A Study of the Female Body By Desmond Morris


Lacking melanin protection I will guess that palms generate little vitamin D

Most people have pale palms which do not tan        
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