There is no great danger of a bad nail infection in the long term. Because nail fungus is an infection of the paronychia tissue, it is often caused by improper nail trimming or violent extrusion of the nail. If it is not good for a long time, there will be local redness, swelling, pain, breakage, fluid flow and sometimes deformation of the nail, so although it is not very dangerous, it needs to be treated actively. You can usually apply topical medication, often using iodophor solution or Bactrim, etc. If conservative treatment does not work, you should go to a hospital for general surgery, emergency department, or hand and foot surgery as soon as possible. The doctor will usually remove part of the nail under anesthesia at the root of the finger, cut off part of the infected tissue, and then give a regular change of medication. During the treatment period, the nail should be kept out of water to prevent infection, and should not be subjected to excessive activity or alcohol consumption.