As there are no oil glands on the skin of your feet, this area tends to become dry. The skin on the heels is thick and dry, and with excessive activity, it tends to bleed and crack. Standing on a cold or hard floor for long, intensive walking, and being overweight are some of the reasons heels crack. The middle part of the foot is hollow and well secured. Most of the body’s weight is borne by the heels. As they are dry and bloated, they tend to crack easily. At times, these cracks go deep and start bleeding.