Without external examination it is very difficult to confirm a diagnosis,but it sounds like a boil. A boil, also referred to as a skin abscess
, is a localized infection deep in the skin
. A boil generally starts as a reddened, tender area. Over time, the area becomes firm and hard. Eventually, the center of the abscess softens and becomes filled with pus. Finally, the pus "forms a head," which can be surgically opened or spontaneously drain out through the surface of the skin.