The underlying factor is that the nail grows inside the flesh, which directly leads to local tissue damage and subsequent bacterial infection, etc. If necessary, the patient should be seen in emergency surgery, orthopedics, or general surgery. Consider local nerve block anesthesia, local nail extraction or entire nail removal, the patient is less inflamed in the necessary to use appropriate topical anti-inflammatory drugs, such as mupirocin ointment. The nail of the thumb can be found inside the flesh of the hand or on the foot, which is generally called an ingrown nail. This condition may lead to local pain and infection, which means that nail infections can easily occur.