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Prolonged standing can cause the skin on the feet to harden, eventually leading to cracked heels. To prevent this from happening, you will need to change position often while wearing appropriate shoes.
Aging of the skin: with age, the skin loses its elasticity, it becomes thick, dry and scaly and the appearance of cracks on the skin of the feet can have a greater impact as we age.
Obesity: High weight puts pressure on the fat pad located under the heel. This can lead to an extension of the pad which, if the skin is not flexible, can apply pressure to the foot and cause cracks to appear in the heel.