Ohio medical malpractice laws

Doctor malpractice: My father went to a doctor about 10 years ago because he had a brown patch on his upper lip. The doctor didn't do anything but look at it and say it was nothing to worry about. Well about a month ago my father had a tumor rise in his neck and they told hm that is was malanoma skin cancer and it is in stage three. His new doctor asked him if he had any signs of it starting on the outside; any red or brown patches, raising of the skin, darkened moles things of that sort. The only thing that anyone including my father had noticed was the brown patch. We beleive that his old doctor the one who let the patch go with no futher examination pretty much sent my father home with cancer and let it progress through 8 years. If we could have caught it then he wouldn't be going through what he is now. Do you think we have a law suit with the doctor that let him go home with a brown patch that he never had before and because of that he is now in stage 3 malanoma cancer? - Is this your question? Add additional information