Blisters are a common problem on the foot and can be very painful relative to their size or location, particularly on the feet. Most are caused by the simple forces generated when walking - friction and shear. A shoe that is too tight (or too loose) can rub the skin with each footstep leading to the collection of fluid in the outer layer of the skin - which we call a blister. Feet which are damp through sweating or getting wet are more at risk from the problem too. Interestin