In a way, corns and calluses are like gel and liquid sanitizers: they're almost the same thing. It's just that corns are usually smaller and appear to be surrounded by what looks like inflamed skin. For nurses, corns are more common around the feet than they would be around the legs. That's because moving around the hospital puts a lot more pressure on the legs than it would on the hands. But it's not like they're impossible to grow on your hands.