Boils are mostly acute purulent inflammation of the hair follicles and deep surrounding tissues caused by Staphylococcus aureus infection. It is usually one or more red nodules with painful sensation and unclear borders. As the swelling and pain continue to expand, the red nodules may gradually harden, and the surface may feel fluctuating when touched. There is a white pus head in the center of the nodule, and when the boil bursts, pus may flow out, after which the pain and redness will gradually disappear. Boils can occur anywhere, but mainly on the head and face. In some patients, they may be accompanied by fever, headache and other discomforts. Most patients do not need treatment and can recover on their own within a certain period of time. However, when the lesion is in severe pain or the systemic symptoms are obvious, it is necessary to consult a doctor in time for targeted treatment.