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.
Protect it. When it's time to leave the house, protect your blister to prevent it from popping and becoming infected. Use a donut moleskin bandage to cover it. If the blister is on your foot, wear socks and comfortable shoes - don't make it worse by walking around in the shoes that caused the blister to begin with.