Foot fungus is caused by a fungal infection that may spread to the hands and cause ringworm. Foot fungus is also called tinea pedis, the cause of the disease is relatively clear, is caused by fungal infection, the causative organisms are mainly trichophyton, red trichophyton, gypsum-like microsporidium, flocculent epidermal ringworm and so on. The mode of transmission is close contact or own body surface transmission. The types of foot fungus are mainly divided into blister type, macerated vesicular type and keratinized desquamated type, which can cause obvious itching sensation. As a result of repeated scratching, the foot fungus comes into contact with the skin of the hands, which may lead to a fungal infection of the skin of the hands, causing tinea cruris. Therefore, foot fungal infections can spread to the hands. It is recommended to go to the dermatology department of the hospital in time to clarify whether there is a fungal infection, and then give treatment with the doctor’s advice.