Fingernails that grow into the flesh are a condition called paronychia, and you need to go to the hospital for treatment. \x0d\Paronychia is often caused by punctures, abrasions, ingrown toenails or pulling out "hanged skin thorns" in the nail groove and nearby tissues. Subungual abscess often occurs due to the spread of paronychia or infection caused by subungual stabbing or secondary infection of subungual hematoma caused by finger crush injury. The main pathogenic bacteria is Staphylococcus aureus. \x0d\In the early stage, measures such as hot compress, physical therapy, and external application can be used, and iodoamine or antibiotics can be applied. \x0d\If pus already exists, longitudinal incision and drainage can be made at the nail groove. When the infection has affected the subcutaneous surroundings of the nail base, longitudinal incisions can be made in the nail grooves on both sides, the epithelial sheet of the nail root is turned up, the nail root is removed, and a small piece of Vaseline gauze or latex sheet is placed for drainage. If pus has accumulated under the nail bed, the nails should be pulled out or the nails above the abscess cavity should be cut off. When removing the nail, care should be taken to avoid damaging the nail bed to avoid deformation of the new nail in the future.