How do white cells heal our blisters?

Question: How do white cells heal our blisters?
- Keywords:
  blood,
  cell,
  injury
Asked by mw to Claire, Liad, Ruth, Ryan, Mako on 18 Jun 2015.
- Ruth Elderfield answered on 18 Jun 2015:
  
  Blisters heal when a new layer of skin grows underneath the blister, the old skin which has turned white and falls off because it is no longer needed to protect the body from infection.

Question: How do white cells heal our blisters?