Infection of a hair root is called "furunculus", or a boil. Furunculus can develop any place on the body where there are hairs (therefore excluding the hands and the feet). People that suffer from diabetes are susceptible to multiple furuncles. Therefore, I recommend you check your blood sugar level to exclude or confirm this possibility. Overweight people are also susceptible to developing furuncles. Hygiene of the body is also very important. Furunculus is treated with antibiotics and/or surgically via an incision that extracts pus from the root. Furunculus on the face (nose, upper lip) can be potentially very dangerous and is treated in the hospital.