. . "Short periods of intense rubbing can cause a blister, but any rubbing of the skin at all can cause a blister if it is continued for long enough.' http://en.wikipedia.org/wiki/Blister To avoid blisters on the hands, gloves should be worn when using tools such as a shovel or pickaxe, doing manual work such as gardening, and handling detergents, cleaning products, solvents and other chemicals." . . .