Mostly site of bruise is at the site of impact however it may be away from the site of impact due to gravity shifting of blood (ectopic bruise)
so site of bruise doesn’t always indicate site of impact.
ectopic bruise are-
1. Fracture floor of anterior cranial fossa or trauma of forehead black eye
2. Bruise behind ear
3. Jaw fracture – may produce bruise in neck