The phrase "little nick" typically refers to a small cut or injury on someone's skin. It doesn't cause a lot of harm but might be a little painful. Full definition
With one little nick of my throat, I threw up right on his arm. (health.com)
And I learned the hard way that the amount of equity I build is no match for maintenance, renovation, and the thousand other little nicks and expenses that owning a house entails. (businessinsider.com)
Each piece is signficant to our relationship, with fun little nick nacks from Hobby Lobby! (thestyledfox.com)