An ingrown toenail is where the edge, or corner, of the toenail grows into the adjacent skin (the skin next to the edge of the nail) and pierces the skin, causing the toe to become red, swollen and tender (inflamed).
Ingrown toenails are common, with the big toe most likely to be affected on one, or sometimes, on both sides. The toenail curves and cuts into the skin, causing the toe to become tender and painful, particularly when you walk on it. If left untreated, the toe can become infected and leak pus.
The most common causes of ingrown toenails are badly cut toenails and tight fitting shoes.
Inflammation
Inflammation is the body's response to infection, irritation or injury. It causes redness, swelling, pain and sometimes a feeling of heat in the affected area.
