The foot was nailed and then chronic infection after the wound is cleared, it is possible that the usual improper wound treatment caused by bacterial infection, resulting in inflammation and abscess, it is recommended to continue to apply antibiotic treatment, disinfection treatment, incision and drainage. 1. Continue to apply antibiotic treatment: you can use some local topical and oral antibiotics, such as topical erythromycin ointment for skin infection, oral metronidazole and amoxicillin, etc.; if the infection is more serious, you need to use systemic intravenous antibiotics. 2. Disinfection: if the infection is not serious, you can use iodine vapour to disinfect every day; if an abscess occurs, you need to go to the hospital to do abscess incision and drainage. 3. It is recommended to pay attention to keep the wound clean and hygienic, eat less spicy food, eat more vegetables and fruits. The foot was nail pierced and then chronic infection after the wound is cleared, need to actively seek medical advice, follow the doctor’s instructions reasonable treatment.