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.
Fix it: You can rub an antiperspirant on the bottom of your feet and between toes. It's also a good idea to dab your feet with an antifungal powder, which will help keep your tootsies dry. At night, dunk feet in a bacteria-killing bath of 1 part vinegar and 2 parts water.