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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Expression of Emotion in Man and Animals by Charles Darwin: Although exposure to alternations of temperature, &c., has probably much
increased the power of dilatation and contraction in the capillaries
of the face and adjoining parts, yet this by itself will hardly
account for these parts blushing much more than the rest of the body;
for it does not explain the fact of the hands rarely blushing.
With Europeans the whole body tingles slightly when the face
blushes intensely; and with the races of men who habitually go
nearly naked, the blushes extend over a much larger surface than with us.
These facts are, to a certain extent, intelligible, as the self-attention
of primeval man, as well as of the existing races which still
go naked, will not have been so exclusively confined to their faces,
 Expression of Emotion in Man and Animals |