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The skin contains a network of small blood vessels containing muscle fibers in their tunica media. These muscles are under the control of the sympathetic nervous system and provide an efficient means of thermo-regulation through vasoconstriction and vasodilation.
When vasoconstricted blood flow through the skin is reduced and so less core heat is lost. With restricted blood flow the skin appears paler. When vasodilated blood flow through the skin is increased meaning more core heat can be lost through radiation. With increased blood flow the skin appears red.
Arteriovenous anastomoses can be found in areas of the body exposed to maximal cooling, such as the hands, feet, nose, lips and ears. These areas are called apical structures and are richly innervated. The anastomoses connect cutaneousarterioles and venules directly, playing an important role in the reduction of blood flow in a cold environment.
Source: Boundless. “Blood Flow in the Skin.” Boundless Anatomy and Physiology. Boundless, 22 Aug. 2016. Retrieved 25 Aug. 2016 from https://www.boundless.com/physiology/textbooks/boundless-anatomy-and-physiology-textbook/cardiovascular-system-blood-vessels-19/blood-flow-through-the-body-185/blood-flow-in-the-skin-923-2180/