Cracked and hardened skin is considered to be related to lack of vitamins and water, exposure to harmful chemical substances, chronic eczema, dermatophytosis and other skin diseases. 1. Lack of vitamins and water: for some people, when the body’s recent nutritional intake is not balanced, prompting the body to lack of vitamins, water and other nutrients, easy to crack the skin hard phenomenon. 2. Exposure to chemical substances: If people are exposed to chemical substances for a long period of time, skin cracking and hardening may occur due to the constant stimulation of the local skin caused by chemical substances. 3. Chronic eczema: mainly caused by the extension of acute eczema, patients mainly manifested by skin roughness and hypertrophy, accompanied by obvious itching, hyperpigmentation, etc., can also be manifested as skin cracking and hardening. 4. dermatophytosis: the disease is mainly caused by dermatophyte infection, patients will have different degrees of skin lesions, itching and other symptoms, can be manifested as skin cracking hard. Daily attention to skin care, avoid foreign body friction stimulation. It is recommended that people with fissured and hardened skin consult a doctor for examination in order to clarify the cause of the disease and then follow the doctor’s instructions for treatment.