Boil (or furuncle)'s a skin disease caused by the infection of hair follicles, resulting in the localized accumulation of pus and dead tissue. Individual boils can cluster together and form an interconnected network of boils called carbuncles. Symptoms The symptoms of boils are red, pus-filled lumps that're tender, warm, and extremely painful. A yellow or white point at the center of the lump can be seen when the boil's ready to drain or discharge pus. In a severe infection, multiple boils may… (More on Boil)