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.
For dry skin on the tops of the feet and on the legs, try a loofah sponge or exfoliating skin product. ALA and GLA: Dietary intake of the essential fatty acids alpha-linolenic acid (ALA) and gamma-linolenic acid (GLA) can improve dry skin by decreasing epidermal water loss.