It is possible to get tetanus from a wound that is a few millimeters deep, but it is usually less likely. Whether or not a patient will get tetanus depends largely on whether or not Clostridium tetani can colonize the wound. Clostridium tetani is a specialized anaerobic bacterium that can only multiply in an environment where the wound is completely out of contact with air. If the wound where C. tetani is located is large and shallow enough to be fully exposed to air, the wound is not likely to cause a tetanus attack. Wounds of a few millimeters are relatively small, and with proper disinfection and subsequent treatment, there is generally no possibility of tetanus. There are of course special cases where a wound a few millimeters deep on the surface may have a deeper wound that is not visible to the naked eye, and there is a risk of infection in this case. In addition, since there is a two-week incubation period for tetanus, if the patient’s wound has not healed for two weeks and he is unwell, it is recommended to visit the infection department of the hospital promptly. In conclusion, patients with wounds of a few millimeters need not worry excessively, pay attention to the cleanliness of the wound and keep the wound away from water, and it will usually heal quickly.