The process of draining a nail infection is anesthesia and disinfection, incision, drainage, and bandaging. 1. Anesthesia and disinfection: it is necessary to anesthetize the lesion. Usually choose local anesthesia mode, can use lidocaine in the affected finger lateral root infiltration anesthesia, wait for the anesthesia to play a therapeutic effect, and then disinfect the perianal skin with iodophor. 2. Incision: Usually, the incision is made from the most obvious place of the abscess to drain the pus, and the direction of incision should be parallel to the direction of skin texture. 3. Dressing: the incision needs to be sterilized with hydrogen peroxide solution, followed by filling with sterile gauze, and finally the incision can be wrapped up with gauze. And change the medicine regularly. Patients with onychomycosis should eat a light diet in daily life, avoid spicy and stimulating food, so as not to aggravate the infection, and consult a doctor when abnormalities occur.