What causes ingrown toenail posted by on October 29, 2011

Pain and inflammation at the spot where the nail curls into the skin occurs first. Later, the inflamed area can begin to grow extra tissue or drain yellowish fluid. Normal toenail growth should be vertical or outward toward the tip of the toe.

An ingrown nail curves down and into the surrounding skin as it grows, causing the skin to grow over the nail. The skin along the edge of a toenail may become red and infected. The great toe is usually affected, but any toenail can become ingrown toenail. So why was the big toe on his left foot so red and swollen?