The most common causes of thick and hard heel skin are chronic friction, chronic athlete’s foot, and foot eczema. If accompanied by obvious discomfort symptoms, it is recommended to seek medical treatment. 1. Chronic friction: normal people’s heel skin for a long time with shoes, socks, friction, easy to cause the thickening of the heel skin keratin, and then the formation of very thick and hard dead skin. 2. Chronic athlete’s foot: the heel skin is infected by fungi, it is easy to cause hyperkeratotic athlete’s foot, showing the heel skin is dry, obviously thickened, and in severe cases, scales will appear. 3. foot eczema: the main cause is also the foot is infected by fungi, may show the heel at the skin rough, thickening, especially eczema recurrence, heel skin is very thick and hard will be more obvious. If the heel skin is thick and hard with obvious itching or other uncomfortable symptoms, it is recommended to go to the hospital in time by the doctor to identify the cause of the disease, targeted treatment.