Onychocryptosis [Ingrown toenails]:

An ingrown toenail is one where the edge or corner of your nail grows down and cuts into the adjacent skin of your toe, leading to your toe becoming red, swollen and tender (inflamed).

Your big toe is most likely to be affected, either on one or sometimes both sides.

Your toenail curves and cuts into your skin causing your toe to be tender, especially when you walk on it. If left untreated, the inflammation can spread to the rest of your toe and the area becomes infected and may ooze pus.

It may smell unpleasant.

Complications

Left untreated or undetected, an ingrown toenail can infect the underlying bone and lead to a serious bone infection.

Complications can be especially severe if you have diabetes because the circulation and nerve supply to your feet can be impaired. Therefore, any relatively minor injury to your foot — cut, scrape, corn, callus or ingrown toenail — can lead to a more serious complication. In rare cases, an ingrown toenail can result in a difficult-to-heal open sore (foot ulcer), which could eventually require surgery. Foot ulcers left untreated may become infected and eventually even gangrenous. Rarely, amputation is the only treatment option.

Radiosurgery

The radiosurgical nail matrixectomy technique is basically the same as the Emmet with phenolization, but
instead of destroying the germinal epithelium with phenol, the matrix is destroyed electrically with a teflon
coated electrode, that protects the overlying eponychium.

The main advantage of the radiosurgery matrixectomy is firstly the lack of the usage of the carcinogen chemical agent, secondly sterilization of the wound, thirdly reduced postoperative pain, and faster healing.