How can i treat a blister on my foot?

Foot Blister: Smaller blisters, ones in which the fluid inside isn't visible, should generally be left alone. Since the skin over the blister acts as a protective shield, lancing it may only invite an infection or cause bleeding. While they don't need to be popped, small blisters may cause enough pain to alter a runner's stride, which may lead to injury. Applying the proper amount of padding can help.