I am not sure they are.For example the one he had in his face which said
This was in the carpool karaoke with James Corden and here you can clearly see he doesn't have the tattoo in his face.(Sorry for bad quality tho)
And so for the chest one,I am not entirely sure if it is real because Taehyung has just exposed it in performances of ON,so I can't really tell if it is real.
I hope this answer was useful