I know Caucasian people's knuckles pale... but what about those with darker skin tones like tan or dark brown? I'm Caucasian and when I grip, say a pencil, really hard, my knuckles pale and it's because of the lack of blood circulation (I think). I know it is the same for everyone else, but does something different happen to people with darker skin tones? Do their knuckles get paler or darker or does nothing happen?

Thanks in advance! :)