Friction against the skin can lead to blisters on the feet, especially when wearing ill-fitting shoes. To prevent foot blisters, the American Academy of Dermatology recommends the following: wear socks that wick away moisture, make sure to wear shoes that fit properly, apply soft bandages to protect problem areas, apply powder or petroleum jelly to reduce friction, and stop the current activity immediately if you have foot pain or discomfort.
American Academy of Dermatology, August 2018