what causes a black eye without getting hit
A black eye is a relatively common result of injury to the face or the head, caused when blood and other fluids collect in the space around the eye; swelling and dark discoloration result-hence, the name black eye.. Most black eyes are relatively minor injuries.
1 Surgical procedures to the face, such as a facelift, jaw surgery, or nose surgery, can cause black eyes.  A certain type of head injury, called a basilar skull fracture, causes both eyes to swell and blacken.