A boil with pus inside that never breaks may be a deeper lesion that is difficult to break on its own. Boil is an acute bacterial purulent inflammation of the hair follicle and its surrounding tissues, usually involving only a single hair follicle and the surrounding tissues, and its etiology may be related to inattention to skin cleansing, local abrasions, poor excretion of secretions from the hair follicle and sebaceous glands, or lowered resistance of the organism. Inflammation of boils is mostly limited and with pus plug formation, preferably on the head, face, neck and back, starting with localized red, swollen and painful nodules less than 2cm in size, expanding in a few days, with yellowish-white pus plugs appearing in the center, which may fluctuate when touched; subsequently, most of the plugs may burst and fall off on their own. Boils without pus plugs are called headless boils and require anti-inflammatory treatment before the inflammation subsides. Generally, boils are difficult to burst on their own when the lesion is deep, if you see pus spots or fluctuating sensation, you can use iodine povidone to spot-coat the affected area, pick out the pus plugs with the tip of a needle or a small knife, avoid squeezing, and then use iodine povidone gauze or ointment to promote the withering away of decayed flesh and the growth of new flesh to be applied to the affected area until the lesion subsides. The above treatments are recommended to be carried out under the guidance of professional physicians.