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.
Use a leather conditioner. Gently clean your shoes by wiping them down, then apply a leather conditioner and a sealant. (You can buy these products online or at your local hardware store.) Make sure to let the conditioner and sealant dry completely before wearing your shoes again.. Rub Vaseline or baby oil on the inside rims of your shoes. This part is most likely to cause blisters, since it comes into frequent contact with the sides of your feet. The Vaseline or baby oil will make the shoes softer and much more tolerable to wear, although you do have to apply it often.