Pus flowing from the crevice next to the toenail is considered to be caused by purulent dactylitis or sub nail infection, the patient will also have obvious painful symptoms, accompanied by fever, local swelling, congestion, edema, and in severe cases, edema of the entire dorsum of the foot, the patient should have underlying diseases such as diabetes, or a history of varicose veins in the lower extremities. In the acute stage, the patient should be promptly selected for surgery for incision and drainage, which can be performed under local anesthesia, and some nails should be cut if necessary, and the patient should also pay attention to regular change of medication after surgery, leaving pus cavity gauze for drainage, and anti-infection treatment with sensitive antimicrobial agents can be selected. In patients with diabetes mellitus, changes in blood glucose should be corrected and insulin treatment should be given if necessary. It is also important to elevate the affected limb after surgery to reduce the symptoms of swelling.