Most runners are fine with the fact that a career as a foot model is not in the cards for them. Calluses and hard heels are just part of the deal in doing what you love. But when it comes to some of the other, uglier ailments, like chafing or a black big toenail, there are ways to steer clear, said Brian B. Adams, M.D., an associate professor of dermatology and director of the Sports Dermatology Clinic at the University of Cincinnati. Learn how to prevent six common conditions — and what to do if you already have them. Continue reading ESPN Sports Dermatologist