Ventilation-perfusion (V/Q) scan is a specialized test that uses a radioactive substance to show the parts of the lungs that are getting oxygen (ventilation scan) and getting blood flow (perfusion scan) to see if there are portions of the lungs with differences between ventilation and perfusion.
Moleskin may be the first commercial blister treatment and prevention product I remember using. My dad always kept some moleskin in his pack and at the first complaint of any hot or sore feet, out it would come.
Castor oil is a popular home remedy for blisters. What to do: Apply before you go to bed, and let sit overnight to help your blister dry up and heal. You can mix the castor oil with apple cider vinegar to further aid healing.