This growth causes swelling at the site where the nail is intruding in the skin. Then infection may start shortly thereafter due the feet harboring bacteria that invade the site. The best thing that can be done about ingrown toenails is to keep them from happening in the first place. However, even the most attended to nails can eventually become ingrown. Therefore, all one can do is to be as diligent as possible and hope for the best.
Most nails become ingrown at the edge of the end of the nail.
Therefore, if the end remains close to the end of the toe, it will have little chance to become ingrown at that spot. Cut the nail straight across at the top but round the two corners to conform with the shape of the toe. If you notice the nail starting to become ingrown, try gently lifting the edge to trim it back. If there is pus present, consult your physician. There is controversy as to whether poorly fitting shoes cause ingrown toenails or not.