I visited my father at a nursing home and saw a bruise. One nurse denied any accident, then later she admitted it. Can I sue?

When I last visited my father at his nursing home, I discovered several large bruises under hiss chin and called a nurse to come examine him. She was unaware of his injuries and said no one had made a note of them in the record. After learning what caused his fall and obtaining help for him, I went back up to the nurse’s station.

I was deeply upset to see that the first nurse I had called had made a false entry in my father’s chart, clearly indicating she had personally discovered his injuries two hours earlier and that she had fully noted them, with plans to have an X-ray ordered as soon as possible. I know these places fear losing their licenses but I found this incident of adding insult to injury to be very appalling. What should I do to stop these people from behaving so dishonestly and medically irresponsible?