Here’s how to treat hand blisters
First, wash your hands and the blister with soap and warm water. Next, swab the blister with iodine. Then sterilize a clean, sharp needle by wiping it with rubbing alcohol. Use the need to puncture the blister. Apply an ointment such as petroleum jelly to the blister and cover it with a non-stick gauze bandage.
Source: The Mayo Clinic www.mayoclinic.org