Furuncle refers to an infection of the soft tissues of the skin, and the infection is usually of an inflammatory nature that is prominent on the skin, such as the appearance of small, localized red spots on the skin surface. If severe, there may be localized abscess formation or pus spots with pus heads, and if ruptured, there may also be pus flowing from the rupture area. The most common cause is localized folliculitis or sebaceous gland blockage, resulting in infectious inflammation, most commonly on the face or the back of the neck, as well as on the hands and feet. The most common is on the back of the face or neck, as well as on the hands and feet. But it is generally treatable, through local anti-inflammatory or oral anti-inflammatory drugs, are able to be treated.