(covers information from several alternate timelines)
A bite mark was a type of injury inflicted by the attacker's teeth.
Measuring the bite radius could determine the approximate height of the individual inflicting it. In 2155 of the mirror universe, Doctor Phlox measured the bite radius of Slar's bite marks on Ensign Kelby and guessed his height to be two meters or more. (ENT: "In a Mirror, Darkly, Part II")