his body displays no signs of the stigmata anymore (at least according to reports I have heard).
if he personally wounded himself for 50 years, there would undoubtedly be marks on his body. apparently he does not have any scarring (50 years of self-mutilation would be visible on the corpse) so I doubt that he seared his hands with acid.
Go back, re-read my post and think about what I said.
You are preaching to the choir.