Paresthesia is a Disturbance in Sensation of the Human Body

Paresthesia and the loss of sensation in a certain area of the body are two of the most frequently noted disturbances in sensation. 

Paresthesia is a sensation of burning, pricking, prickling, creeping or tickling on the skin without a cause. It is most often related to irritation or injury of a nerve root or a sensory nerve. A paresthesia might come and go, or it may be chronic.

One of the most common kinds of paresthesia is the feeling as if a part of the body is "asleep" or the feeling of "pins and needles." Another relatively common paresthesia is "formication."  This is the feeling of having bugs or insects crawling over and/or under the skin.