Callus is medically known as callus, foot callus is usually caused by long-term wear of ill-fitting shoes and socks, foot deformity, etc.; hand callus is usually caused by frequent friction on the hands. If you suffer from foot callus, it is considered to be caused by long-term wearing of ill-fitting shoes and socks or long-term wearing of high-heeled shoes, which leads to long-term friction of the feet and induces callus. Secondly, it may be caused by foot deformities, such as bunion, hammer toes, etc. If you stand or walk for a long time, you may suffer from calluses. If standing and walking for a long time, the soles of the feet are subjected to long-term pressure, which is also easy to induce callus. If the child suffers from hand callus, it is considered to be caused by frequent friction on the hands, such as playing musical instruments and using hand tools with the hands frequently. If the child has a finger-biting fetish, it is also easy to induce hand callus. There are many reasons for callus, it is recommended to take good care of the callus area and reduce the friction on the local area.