Invulnerability

Sometimes called "Superhuman Durability", Invulnerability is a term used to describe the ability of some characters to withstand any amount of physical damage, pressure, or harmful force of any kind, causing little if any harm or pain to the individual gifted with this power.
Things like knifes or bullets will not penetrate the skin, and punches or kicks will cause no pain. The skin and exposed areas of the body become resistant to damage, either from the the very cells becoming highly durable, or some kind of physically projected force field that protects the body. The amount of invulnerability can differ between individuals, from being completely invulnerable to any and all forces, to slightly invulnerable to specific things.