pinprick

Short definition from Wiktionary

Noun

1. 1
   An insignificant puncture made by a pin or similar point.
2. 2
   A mildly annoying wound or damage.
3. 3
   A very tiny dot.

Verb

1. 1
   To produce a jabbing sensation, like a pinprick, in.
2. 2
   To puncture with a tiny hole or holes.