User blog comment:FairyRaven/Fairy Tail Chapter 371: Tartarus Arc, Part 2: Song Of The Heavenly Dragon, Review and Commentary/@comment-2214433-20140214095001/@comment-7418318-20140214123005

Rednuht, I meant that the few cuts we saw on Erza were already toned down a lot from what we saw in Rave even when they were still visible, bleeding wounds, not in that shot after Erza is freed.

Like this it's just a bad joke, unless it turns out that either Kyouka or Tentecles somehow closed up her wounds (probably with something painful like fire or acid) in between torture session to make sure she didn't die of blood-loss prematurely.