A pus-filled boil can be self sterilized by picking at the skin to remove the pus plug, but squeezing is contraindicated. If there are multiple boils fused together or if there is generalized malaise, medical attention should be sought for treatment. A boil is an acute suppurative inflammation of a single hair follicle and surrounding tissues, mostly caused by Staphylococcus aureus infection. In the early stages, boils are red, swollen, hot, and painful, and can be treated with hot compresses and ichthyol ointment. In the later stages, yellowish-white pus plugs may appear on the top of the boils, which need to be extracted and treated. After the boil has suppurated, the patient can disinfect the boil and the surrounding skin with iodine povidone, and then use a needle to puncture the skin of the boil to pick out the pus plugs, but it is forbidden to squeeze the boil, as squeezing will easily lead to the spread of the infection. The pus plug can be removed by applying wet gauze moistened with iodophor until the lesion subsides. Generally, boils can be treated on their own, and the operation is simple, so be careful not to squeeze. However, if multiple boils merge into a carbuncle, it is necessary to consult the doctor promptly and perform incision and drainage after local anesthesia; if the boil is accompanied by fever, headache, general malaise and other symptoms, it is also necessary to consult the doctor, and follow the doctor’s instructions to use ceftazidime and other antibiotics to treat the boil.