Heel cracks, also known as fissures, are the result of dry, callused skin on the heel combined with excessive pressure and skin displacement during weight bearing. The dry heel skin begins to develop a thickening of its top layer as a natural protective measure from pressure, they way all calluses form. As the callus tissue begins to thicken, lateral pressure from the side and flattening pressure from the top due to the rounded shape of the heel causes the callus to crack in the middle, and a fissure forms. This crack can be fairly deep, can bleed, and can be very painful to walk on. Treatment requires a combination of moisturizing the skin, filing down the callus build up, and reducing the excessive pressure on the heel.