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I know it is caused either by blood vessels beneath skin , or some pigment called "pheomelanin" . But what is it in fact?

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closed as unclear what you're asking by Tyto alba, another 'Homo sapien', David, kmm, The Last Word Apr 17 '17 at 0:00

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. $\endgroup$ – WYSIWYG Sep 18 '16 at 14:22
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The answer lies in hemoglobin, which is responsible for the transportation of oxygen throughout our bodies. It is the protein found in red blood cells, and thus it has a reddish hue to it. When an organism has lightly pigmented skin, the oxygenated hemoglobin causes the pinkish hue that you are describing.

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  • $\begingroup$ then , this happens if the skin is not much pigmented, and if there are much melanin pigments , the hemoglobins in blood cant be visible, isn't it ? $\endgroup$ – user596200 Sep 18 '16 at 16:04
  • $\begingroup$ Some of the information contained in this post requires additional references. Please edit to add citations to reliable sources that support the assertions made here. Unsourced material may be disputed or deleted. $\endgroup$ – Tyto alba Apr 15 '17 at 11:50

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