The treatment of an ingrown toenail partly depends on its severity. Shaving against the grain can often cause ingrown hairs. A less widely used treatment for ingrown toenails is nail bracing. Surgical treatments of ingrown toenails include a number of different options. Narrow pointed shoes (or tight socks) can be a factor in causing ingrown toenails. Ingrown hairs are also caused because of lack of natural exfoliation in the skin. Pseudofolliculitis barbae can further be divided into two types of ingrown hairs&colon; transfollicular and extrafollicular. This also reduces the risks of cuts, soreness, and ingrown hairs. Ingrown eyelashes will rub the eye causing extensive corneal ulcerations. These included a silver clip designed in 1946 to treat ingrown toenails. Existing razor bumps can often be treated by removal of the ingrown hair. Some use "lateral onychoplasty," or "wedge resection," as the method of choice for ingrown toenails. This procedure can result in chronic ingrown nails causing more pain. Many KP bumps contain an ingrown hair that has coiled. A nail avulsion is performed to remove all or part of a chronic ingrown nail.