I'm not an expert, but from what I know, many cases of stigmata have been proven to be hoaxes. The rest could be. I think that I have read somewhere that no one in a controlled scientific test could replicate the stigmata phenomena. When I was working on my Master's in Humanistic Psychology, I did a lot of reading on the capability of mind-body interaction. It is very possible for us to make ourselves sick or to cure ourselves from many ailments if we have the right mindset and beliefs. I suppose that it is possible for a person to exhibit stigmata if their mental state was in the right place. This has nothing to do with any connection with the crucifixion; merely a manifestation of a strongly held belief. There are many "miracles" when it comes to our physical bodies being cured of disease or even being raised from the dead. Yes, there are plenty of cases of dead people coming back to life. So my thinking on this is that stigmata is possible for a person with extremely strong beliefs, but I don't buy any connection to Christ other than that belief. In other words, it isn't a sign for the rest of us, and that person is no one that should have any influence on the rest of us, except maybe as an inspiration for such strong faith.