Nursemaid's Elbow, or "pulled elbow," occurs in small children as a result of being lifted, yanked, swung by the hand or wrist, or falling on an outstretched arm. One of the arm bones slips out of place slightly.
Your child is bleeding heavily.
The wound is deep.
The edges of the wound are gaping.
The wound is spurting blood.
You can't stop the bleeding after 10 minutes of direct pressure.
An object has punctured the skin and is still in the body.
The cut involves the eye or the cartilage of the nose or ear.