Usually do not work finger callus (medically known as callus) causes mainly with long-term mechanical friction, such as pressure, friction, etc., caused by excessive proliferation of the stratum corneum, although usually do not work, but some other stimuli, such as contact with solvents that stimulate the skin, occupational factors, etc., are also prone to cause the hands of callus. 1. Contact to stimulate chemical solvents: such as contact with acidic, alkaline chemical solvents, or high heat stimulation, frequent contact with laundry detergent, detergent, etc., can easily lead to injuries to the skin stratum corneum overgrowth, triggering callus. 2. Occupational factors: hand work industry, such as players, musicians, etc., long time hand pressure can lead to the occurrence of callus. It is recommended that patients according to their own situation, if necessary, to the regular hospital dermatology consultation, follow the doctor’s instructions reasonable treatment, usually to avoid direct contact with irritating substances, reduce the skin friction, can effectively prevent the generation of callus.