If you had to guess, how many steps do you think you will take in a lifetime? According to the Pro Foot Center, the answer is 115,000 miles. That’s roughly equivalent to walking across the United States 40 times. With all the walking we do on a daily bases in different types of shoes, it's no wonder foot problems are so common. Check out these four problems that affect the skin of the foot — but can appear anywhere on the body.