Have you ever had Corn in your feet ?Have you had rough elbows and knuckles?Lets understand these issues by understanding the reasons behind it and how to treat these and prevent them.Corns and calluses are hard, painful areas of skin that often develop on the feet in response to pressure or friction.They happen when the skin tries to protect an underlying area from injury, pressure, or rubbing. Neither is dangerous, but they can cause irritation.