The heel is also known as the heel of the foot, this part of the crust is mainly related to skin aging, dry skin, callus and tinea pedis, but a few diabetic patients can also appear similar symptoms, the following common causes: 1, skin aging: as the patient grows older to a certain stage of its skin can be aging, so the heel can appear local keratinization, causing this part of the dry crack and thus produce crust; 2, skin Dryness: this kind of situation is more common, because the patient’s heel skin stratum corneum is thicker, when the sebaceous glands secrete normal oil is more difficult to reach the skin surface sebaceous membrane through the stratum corneum, so it can cause the heel to produce crust. In addition, some patients due to dry weather, reduced water intake or vitamin A, vitamin E deficiency, etc., can lead to reduced water content in the body, resulting in insufficient hydration of the cuticle of the heel skin surface, causing local skin dryness in this area, and then produce crust; 3, callus: such cases are more likely to manual workers, mainly due to long-term mechanical stimulation of the patient’s heel, such as long-term standing, walking. This is mainly due to long-term mechanical stimulation of the heel, such as prolonged standing and walking, and the appearance of yellow, flat, crust-like patches on the heel, along with mild pressure pain; 4, ringworm: this disease is mostly caused by fungal infection, accompanied by itching symptoms. It can lead to a lack of sebum in the skin of the heel, which is characterized by rough, hypertrophic crust-like changes in the skin of one or both heels, accompanied by scattered, radiating cracks; 5, diabetes: a few diabetic patients are more likely to have crusty heels due to poor peripheral circulation, so patients need to actively treat the original disease to relieve this symptom.