Also, since the blood in your body is a lot darker, the veins appear darker. You may also notice that different sized blood vessels appear to be different colors. Another thing it can depend on is how you see color and how your brain perceives certain color against the color of your skin.
What does Allison mean? Allison [al-li-son] as a girls' name (also used less widely as boys' name Allison) is of Old German derivation, and Allison means noble, exalted. Allison is an alternate spelling of Alice (Old German). Allison is also a variant of Alison (Old German).
The variant spelling Allison is the most common form in the United States. Other variations include Alisson, Allyson, Alyson, Alysson, Alicen and Alycen, with nicknames Allie, Alley, Alie, Ali, Ally, Aly, Aley and Alli. Allison also has separate, disputed roots as a family name. In countries including Brazil, Portugal and Indonesia, Alison and variant forms are also used as masculine given names. Alison, variant form Alizon, is a French surname.