Three months after the foot was pierced by the nail surgery pus, may be related to suture stimulation, wound infection, wound scar ulceration and other conditions, need to clarify the cause of the disease, through the debridement treatment, drug treatment (levofloxacin, etc.), re-operation and other methods of treatment. 1. Suture irritation: If the nail piercing is relatively large and non-absorbable sutures are used, the patient may have a rejection reaction to the sutures, resulting in pus flowing from the area and other phenomena. It is necessary to take out the suture in time and carry out regular sterilization and dressing change for the area. 2. Wound infection: If the area is not taken care of after the surgery, sweat or dirt invasion will make the wound secondary infection, causing pus phenomenon. You need to take oral erythromycin, levofloxacin, cefixime and other anti-infective drugs in time, and flush the wound at the same time. 3. Wound scar ulceration: If the patient belongs to the keloid body, the site may form scar tissue, if the scar tissue healing is not good, it is very likely to have pus pain and other phenomena. Regular dressing changes are needed, and if necessary, the scar tissue can be removed by surgery. Due to the many causes of the disease, patients should seek medical examination at the first time, and strictly follow the doctor’s instructions to carry out the appropriate treatment.