Jets' Dillon assessed match penalty for illegal check to the head
Just over four minutes into the second period, Acciari controlled the puck through the neutral zone before Dillon elevated himself and contacted Acciari in the head with his shoulder.
Acciari's helmet was sent flying by the contact and multiple Penguins players rushed to defend their teammate.
Pittsburgh was leading 1-0 at the time of the incident on a first-period goal by Kris Letang.
Dillon has six goals and 15 points in 47 games with the Jets this season, his third with the team.