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.
Conventional toe stretchers, like the Yoga Toe, are the most popular type of toe separators on the market. Made of gel, plastic or silicone, they slide in between your toes and sit above, between and below your toes. This works to spread the toes apart and away from the ball of your feet.