Skill: first aid.
This skill is quite difficult to learn.
The skill takes rather long time to use.
When you get hurt (and you will), you are going to need some way to heal your bleeding wounds. Small wounds do regenerate without medical attention, but using first aid can lessen the life force wasted on bleeding.
Using first aid can help to close the bleeding wounds. Having bandages available will make it possible to tie off larger wounds, but it is possible to use this skill without any external items as well.
Other uses of this skill are to revive unconscious players and to heal them.
The result is affected by your dexterity and wisdom as well as your knowledge in first aid.