Ingrown Toenail What Is an Ingrown Toenail? When a toenail is ingrown, it is curved and grows into the skin, usually at the nail borders (the sides of the nail). This curvatureĀ of the nail irritates the skin, often creating pain, redness, swelling, and warmth in the toe. If an ingrown nail cutsĀ the skin, bacteria may… Read more »