Haw. Code R. § 16-74-121
If an accidental butt occurs during a contest, the referee shall immediately warn the boxers in such a manner that everyone present may know what had transpired and deduct points for the offense. When a boxer receives a cut from an accidental butt, the referee shall halt the contest immediately and examine the cut to see whether the contest should be stopped. If the contest is to continue, the referee shall deduct points for the offense and notify the judges to do likewise. If the contest is permitted to continue, and the boxer who received the cut suffers further punishment, causing the cut to bleed so that the contest must be stopped, the decision shall be awarded to his opponent on a TKO-I ("I" denotes "Injury"). If a boxer is accidentally butted by an opponent and is so injured by the butt that he cannot continue, the referee shall stop the contest and:
This rule applies only to accidental butting. Intentional butting is a foul and shall be penalized as such.
Haw. Code R. § 16-74-121