The Shroud is probably the only Roman "relic" the authenticity of which I am willing to consider might possibly be legitimate... it's purely conjecture, but I'm willing to consider the possibility that the Glorification of the Incarnate Shekinah might have left "afterburns" on the fabric in question. Is the Shroud genuine? I dunno, and I don't intensely care. But it's certainly an interesting piece of fabric, IMO.
Of course, if "the Shroud of Turin" really is the Burial Shroud, then "stigmata" of the hands is either a fraud or a medical curiosity... not truly "stigmata".