Bacterial skin infections can be spread by shared cosmetics or
washcloths, close human contact, or
by contact with pus from a boil
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.