Pinprick (noun)

1. A very small puncture made by a pin.
2. A small, insignificant wound or injury.

Origin:

Pinprick comes from the word "pin" meaning "small" and "prick" meaning "puncture".

Examples:

1. The pinprick didn't even bleed.
2. The needle caused only a pinprick of pain.
3. He felt a pinprick on his skin and looked to see a mosquito.
4. The pinprick of blood on the finger was the only sign of injury.
5. The pinprick was so small it was almost unnoticeable.