Washing underwear in public washing machines can spread infectious diseases and it is recommended to avoid using public washing machines. Due to the lack of sanitizing measures in public washing machines, especially if there are infectious diseases among the users, germs can spread and be infected through the washing machine, but the probability of this is relatively low. If public washing machines are properly cleaned and sanitized, the probability of spreading diseases is almost non-existent. It is recommended that the general public avoid washing underwear in public washing machines and hand-wash personal clothing to minimize the possibility of spreading STDs and skin diseases. If there is an unavoidable need to use a washing machine, it should be disinfected with a disinfectant before use.