Generally, a runny boil is a sign of improvement, but it can also be a sign of continued expansion of the inflammation. Multiple boils combined together are likely to develop a carbuncle, at which point the runny pus can usually cause serious complications, so if the boil is runny and accompanied by fever, chills, headache, and other symptoms that further aggravate the infection, seek prompt medical attention. A boil is an acute purulent infection of a single hair follicle and its sebaceous glands caused by the invasion of Staphylococcus aureus from the hair follicle or sweat gland. The main manifestation is a small red papule that will gradually increase in size over time, and in severe cases will gradually become pus-filled. The pus usually flows out gradually after the pus plug of the boil is discharged, and then it will gradually turn better. It is important to take precautions to prevent infection. After a boil has pus, you should be careful not to touch it with your hands, especially in the dangerous triangle of the face, which is rich in blood vessels and may cause serious consequences such as meningitis if infection occurs. Therefore, when a boil has pus, it is best to go to a hospital and have the pus drained by a doctor in a sterile environment, and then disinfect it with iodophor and use antibiotic medication to prevent infection. In addition, it is important to eat a light diet, avoid spicy and stimulating foods, and adjust your daily routine. When multiple boils are combined to form a carbuncle, the patient feels pulsating pain, which may be accompanied by systemic symptoms such as fever, chills, headache, loss of appetite, etc. In serious cases, it may lead to death secondary to toxemia and sepsis. Therefore, a boil with pus may also represent the further development of the infection, and if symptoms such as fever and pain occur, timely anti-infection treatment is needed to avoid the formation of a more serious carbuncle.