Ingrown toenails are nails that grow into the sides of the toe.
Often, ingrown toenails are caused by cutting the nail incorrectly or too short. When the nail cuts into the skin, an infection may form, making the toe swollen, red and puss-filled. When this happens, you may feel a dull aching pain in the affected toe. Eventually, an ingrown toenail can make it difficult to wear shoes or walk comfortably. If you have an ingrown toenail, you need to see a doctor.