A cut on the hand in a public bathhouse is generally not contagious to certain diseases if the wound is relatively small, but if the wound is relatively large and there is blood from a person with a contagious disease in the bathhouse, there is a risk of contracting certain contagious diseases. Generally speaking, if the wound area of the cut hand is relatively small, it will not infect some diseases. If the wound area of the cut hand is relatively large and bleeding occurs, when bathing in a public bathhouse, if there is blood from patients with hepatitis B, hepatitis C, AIDS, syphilis, etc. in the public bathhouse, then some infectious diseases will be infected through the transmission of blood into the human body. Therefore, we should pay attention to personal protection in daily life, when the hand is cut, should be promptly sterilized with iodine or alcohol, avoid going to public bathhouses or using public supplies, to prevent infection of disease, if it has been diagnosed to be infected with certain infectious diseases, should go to the hospital in a timely manner for targeted treatment.