Paresthesia

Paresthesia is a sensation of tingling, tickling, pricking, or burning of a person's skin with no apparent physical cause. The manifestation of a paresthesia may be transient or chronic.

The most familiar kind of paresthesia is the sensation known as "pins and needles" or of a limb "falling asleep". A less well-known and uncommon but important paresthesia is formication, the sensation of bugs crawling underneath the skin.