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.
Abhyanga or an Ayurvedic massage with effective natural and hydrogenated vegetable oils like Coconut oil, Sesame seed oil etc can heal your cracked heels effectively. Essential oils like Lavender essential oil, Lemon essential oil, Eucalyptus essential oil etc, can heal your infected heels and make the foot skin soft.