What is the limit of the Death Eraser? The Death Note Wikia states that...


  
  The Death Eraser can revive the people that have been killed by the note
  The Death Eraser is an artefact
  


In the wikia is also states  if you wrote "dies from a tragic accident or something",would the person's wounds or destroyed body parts be healed?

Which lead me to ask what is the limits of the Death Eraser and if you wrote "commits suicide by gun" and you used the Death Eraser to bring them back, would the wounds heal even though they come back to life?
First of all, The Death Eraser is a plot device exclusive to the manga pilot. 


  Death Note includes a rule stating that if the owner of the notebook uses the Death Eraser to erase names in the Death Note, the victims come back to life if they have not been cremated.


With this said we know atleast a body is needed for this


  Taro Kagami is offered the Death Eraser by Ryuk, and is told that he can erase the names in the Death Note and the victims will miraculously come back to life


Using the description Miraculously make's it quiet easy for them to get away with just about anything. They are miraculously healed, or the miraculously live on as just a severed head.

Simply said, It all comes down to the fact its a miracle.