My post is coming too late I guess, but, anyway I'll try to give some input.
When someone has low blood pressure, his body tries to manage that by starting the compensatory mechanisms that will increase blood pressure that is low.
For example, arterioles will constrict.
The more constricted arterioles are, the greater their resistance to blood flow and the higher the blood pressure. Constriction of arterioles increases blood pressure because more pressure is needed to force blood through the narrower space.
On the other side, constricted or narrowed arterioles will cause blood flow to the skin, feet, and hands to decrease. As a result these areas may become cold and turn blue.
Lack of blood flow (constriction of arterioles, damaged blood vessels due to smoking) first will manifest with sensation of tingling, pricking, or numbness of a person's skin, known as paraesthesia.
Can also be a symptom of vitamin deficiency and malnutrition
Irritation to the nerve due to the carpal tunnel syndrome.
Nerves below the head may be compressed where chronic neck and spine problems exist and cause paraesthesia.
This can be also a transient part of panic attacks.