Basic First Aid for Blisters

   Whether or not a blister needs any treatment is debatable. If the blister 
   is small, unbroken and not very painful, it is probably best to leave it alone.
   Cover it to prevent continued rubbing and pressure on it that can cause it to
   swell more and possibly burst on its own.
   If the blister is large or painful – especially if the activity isn’t finished 
   (such as you are in the middle of a hike) – follow steps to drain and 
   dress a blister. 

•  Use a sterilized needle and make small punctures at the edge 
   of the blister and express the fluid. 

•  Then apply antibiotic ointment and cover it to protect it from further rubbing and pressure.