Bleeding Wound
From NsdWiki
A creature can sustain a wound so grievous that blood will continue to pour from it after the initial injury. Left untreated, a bleeding creature will eventually die of blood loss.
Only certain types of attacks can deliver a bleeding wound. A creature subjected to such a wound takes Continual Damage [1 HP per round; bleeding]. Every subsequent bleeding wound the creature receives compounds the problem and increases the damage per round by 1.
Characters can make a Healing check to apply pressure to the wounds and stop the hemorrhage. See the Healing entry in Chapter 6: Skills for more details. In addition, natural remedies exist, and characters can leverage any item which restores HP to immediately cease bleeding damage.