User blog comment:FairyRaven/Fairy Tail Chapter 429 & 430: Code Blue & Purification Ritual, Review and Commentary/@comment-1359322-20150421151835/@comment-7418318-20150421160515

Oh... I didn't read that far into the article, since it seemed pretty straight-forward at first. oO

Though the article only mentions that it becomes painful, not anything about the skin being worn away or blood.