Ingrown nails are nails that grow into the flesh and are a common condition in surgical clinics. Early ingrown toenails are painful, and ingrown toenails are easily complicated by infection of the nail groove tissue, clinically known as nail groove infection, when there is obvious local redness, swelling and heat, accompanied by severe pain, and pus, local purulent discharge. The main reasons for its occurrence are toenail edge trimmed too deep, too low, or leave a sharp angle, resulting in toenail edge tissue damage infection; shoes wearing too tight, or long time wearing high heels, wearing pointed thin shoes, so that toes and shoes over-extrusion; tissue trauma caused by hematoma, or adolescents love sports, such as playing football, running, etc., will make toes and shoes over-extrusion, collision; middle-aged and elderly people serious mold infection The toe nail is curled and deformed; congenital deformity of the toe. The result of all of the above is: repeated friction between the toenail and its edge tissue, in addition to redness, swelling, heat and pain, there will be pus accumulation under the nail, and the wound will not heal over time. Proliferation of granulation tissue at the edge of the toenail leads to a relative narrowing of the nail bed and the direction of toenail growth. Obviously, ingrown toenails cannot be cured by trimming and nail removal. People with ingrown toenails can have surgical procedures to relieve the pain. The scope of surgical removal is determined according to the shape of the individual toenail, so that the nail growth direction is “unobstructed” and the ingrown nail is completely cured and will not recur. Although ingrown toenails are stubborn, they can be prevented and cured if the causes of ingrown toenails are understood and the treatment methods are improved and refined.