An infected ingrown hair is the result of a grown-out hair that has curled back into the skin and become infected. Recurrent cases are sometimes called folliculitis.
Normally, new hair grows straight out of your hair follicles. These follicles are located within the skin. As the hair matures, it exits the skin’s surface and continues to grow. But sometimes, the hair grows crooked or curls back under before it has a chance to exit the skin. This is called an ingrown hair.
Ingrown hairs are common and can generally be treated at home, even if the affected area becomes infected. Complications aren’t likely unless the infection and ingrown hair are left untreated.