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.
Even after washing thoroughly, you may get mild rashes from poison oak oil. In such case, just a cold compress can work wonders. Apply icepack on your itching blisters for about 15 minutes every hour. However, do not use ice directly on your skin. Wrap it in a clean cloth and apply this cold compress on your rashes.