If your big toe slants sharply in toward your other toes, with a big bump on the knuckle of your big toe, you've got a classic bunion. Corns are spots of thick, rough skin, where the tissue builds up on toes constantly barraged by too much rubbing or pressure. A buckled-under toe, called a hammertoe, can result from muscle weakness caused by diabetic nerve damage. All of these make it hard to fit shoes comfortably. But a good podiatrist can help you fix these problems and take better care of your feet.