(HealthDay News) -- Calluses are patches of rough, thick and yellowed skin that often develop on the soles of the feet. Corns are smaller patches of thickened skin that form on the toes.

The University of Michigan Health System lists these common causes of corns and calluses:

• Wearing shoes that are too tight or poorly fitted, which rub on your feet.
• Wearing shoes or sandals without socks.
• Wearing high heels.
• Having a high arch, which adds weight and pressure to the ball of your foot and your toes.
• Having an uneven distribution of weight on your feet as you walk, sometimes caused by a physical abnormality.
• Having sharp bones in your feet that may rub against your shoes.
• Having bony feet that lack typical cushioning.