What Causes Blisters? - Blisters

Blisters typically develop due to friction on the skin. This can occur from the rubbing of clothing or sports equipment on the surface layer of the skin. Over time, continued friction can cause the top layer of skin to separate from the second layer of skin. (See an image of the skin layers).

One warning sign that a blister is about to develop is redness and warmth on the skin called a "hot spot." Next, fluid fills the space between the top two layers of skin to provide protection from continued rubbing. When this happens you will see a blister that looks like a little bubble on the skin.

Most people get blisters on the heels, soles of the feet, and palms of the hands because they rub against shoes, socks or sports equipment. This type of friction, especially in moist, warm conditions, is perfect for blister development