A blister is a small pocket of fluid that can form on the foot. They vary in size and can occur for a variety of different reasons. On the feet, blisters can cause difficulty in walking, standing and exercising for long periods of time. Blisters can be caused by friction created by being on your feet for several hours a day, poorly fitting shoes, excessive moisture or perspiration and fungal infections. Some home treatments for blisters include cleaning it with antiseptic, making a small puncture in the blister with a needle, allowing the fluid to completely drain out and covering…