Spawning blood splatter at the point the bullet hit a collider?

So, I want a blood splatter to appear at the point the bullet hit my zombie. As it stands right now it will only show up at the feets of the zombie.

 var HP : int = 100;
 var hit : GameObject; //The blood splatter it self.
 
 
 function OnCollisionEnter(collision : Collision){
     if(collision.gameObject.tag == "Bullet"){
         HP -= 10; //How much damage the zombie take when hit.
         
         audio.Play();//Sound of the zombie geting hurt.
         
         var blood = Instantiate(hit, transform.position, Quaternion.identity);
     }
 }