An ingrown toenail is also known as onychocryptosis. It is a common condition in which the nail plate grows into the surrounding periungual skin. The condition causes inflammation and, in many cases, infection. It usually affects the hallux (big toe) and can occur at any age. If left untreated, an ingrown toenail can cause pain, discomfort, and even disability. Visit Care Podiatry in Anaheim or Lakewood, CA, to get the evaluation done as early as possible.