Do some black skin cells wipe/wash off? Whenever we wipe/degrease a
patient 24 hrs post-op we use acetone. There is always a darker
residue on sponge from very dark complected patients compared to light
complected patients. My sister's longtime boyfriend has black
complected skin and there is dark residue in tub and on washcloths.
I've even noticed it on neck collars. My co-workers are laughing at me
but I, up to now, always thought everybody knew this to be true. Maybe
I'm the big dummy. Do you know?  Thanks for your help.

bluesidedfrog-ga

Hmmm?  I never thought about it before, but probably the bits of dry
skin that we all lose are darker for those persons with darker skin. 
Pale people never notice them at all, unless they have a sunburn. 
Maybe someone with experience with blisters or second degree burns of
dark complected persons can add something.

I have been taking medical courses and we have studied these cases in
the past.  The color change comes from the dead skin cells that a
person looses during the course of the day.  The skin they have
underneath is even slightly lighter because they also tan and you may
even see outlines of where the skin has peeled just like you would see
the outline of where a non-colored person's sunburn would peel. 
That's all there is to it.

:-)