It did. The author must've forgotten. Unless they literally stitched the piece of skin back xD
Actually, if her skin has healed, somebody could also just finish the tattoo on the newly grown skin.
Yo, did Gonza (or Genno, since I'm not sure if some of this is not just a hallucination) really cut the dude getting laid in half, together with his gal? That's just next level xD