Bruising is one of the Afflictions that the player can get while in The Long Dark. It can be obtained by getting attacked by Wolves or a Bear multiple times, or by falling from a great height.
Effect
Bruising only takes effect if the player is attacked by wolves, bears, or falls down from a great height, and will increase the amount of Condition lost from the incident. If the player avoids these circumstances, bruising does not affect the player.
Treatment
To get rid of bruising, treat whatever condition caused the bruising, either the Laceration, Sprained ankle, or Sprained wrist that brought the condition on in the first place. Bruising doesn't have it's own special condition to treat.