The corns are generally as big as beans or larger, with smooth surface, flat or slightly raised leather, clear boundaries, light yellow or dark yellow, and inverted cone-shaped keratin plugs embedded in the dermis. Because its tip compresses nerve endings, it hurts when walking. Corners are more common in the middle of the foot, outside the little toe or inside the big toe, and also on the back of the toe. Cornus, which occurs between the 4-5 toes, is soaked by sweat, showing a gray-white soaked stratum corneum. This is called soft corn.