You launch a small poisonous needle from your hand produced via magical means. Make a ranged spell attack against the target. On a hit, the target takes 1d4 poison damage each turn for the duration of the effect. An afflicted target can use an action to pull the needle out; ending the effects prematurely. 

If concentration is broken the needle will dematerialize and the effects will also end prematurely.

This spell's damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).