Dry cracked feet may be caused by physiological reasons, such as skin aging, long time being impregnated by water, etc.; it may also be caused by pathological reasons, such as tinea pedis, chronic eczema, hair erythema fissures and so on. 1. Physiological reasons: skin aging sebaceous gland function decline, sebum secretion is reduced, the foot is easy to dry crack; on the other hand, the foot long time by the water impregnation of people, such as rice farmers or heavy laborers, the skin barrier function is impaired, prone to dry cracked feet. 2. Pathologic causes: (1) Tinea pedis: it is caused by fungal infections such as Trichophyton rubrum, and it is mainly transmitted through skin contact, and some people are infected by contact with floors, shoes and socks stepped on by people with tinea pedis, and it is more likely to appear in people whose shoes and socks are not breathable and those who have led a collective life. It can cause flaking and cracking of the feet. (2) Eczema: often developed from acute eczema, is a kind of internal and external multi-factors caused by chronic skin inflammatory disease, may be related to heredity, contact with allergens. If the skin on the feet is exposed to allergens for a long time, such as new shoes and socks, the feet may become flaky, cracked and itchy. (3) Hairy erythematous chaff rash: the cause of the disease is not known, may be related to heredity, vitamin A deficiency, etc., the course of the disease is mostly chronic. In addition to the neck, trunk, limbs appear follicular keratosis papular manifestations, can appear in the palm and toe hyperkeratosis, cracking, etc., can be manifested as dry cracked feet. There are many reasons for dry cracked feet, it is recommended that patients go to the dermatology department of the regular hospital in time to make a clear diagnosis and standardize the treatment under the guidance of the doctor.