I saw this movie with my sister in around 2010-2014 about earth has been inhabited by monsters that were originally human.  This blue liquid makes humans into these monsters or deformed humans.  There are teens in this movie who hide to survive the monsters and they have this prophecy where they think someone with 13 scars on their arm will save earth.  Everyone in this teen group has scars and they believe this one girl has like 50 scars because she’s is a really good fighter, but in reality she has no scars.  Earth looks abandoned and like a wasteland or junkyard a little bit.  Please help me I’ve looked everywhere for the title!!