Bactrim is the trade name and generic name for mupirocin ointment, which can be applied after a boil has pushed out pus, however, it is advisable to visit a hospital to ensure that the pus inside the boil is drained. Boils are common superficial infectious lesions that appear as a result of localized skin breaks or other causes that lead to bacterial invasion of the hair follicle tissue. The common causative organism is Staphylococcus aureus. Typically, boils appear singly, and in a small percentage of patients, multiple boils may be present and may also fuse to form carbuncles. With the gradual development of the lesion, a localized superficial abscess will form, which can mostly burst on its own. At this time, you can use povidone-iodine disinfection, and then apply mupirocin ointment, which can fight infection, stabilize the local condition, and promote the inflammation to subside. It should be noted that if the patient’s condition is serious, the internal pus is not cleared or carbuncle is formed, the simple use of mupirocin ointment may not be able to cure the lesion. It is recommended that the patient go to the surgical clinic of the hospital and be treated with regular medication under the guidance of the doctor, so as to ensure that the local inflammation subsides. If the patient’s condition is serious, surgical incision and drainage may be required to remove the internal pus and regular antibiotic treatment to ensure that the lesion is cured.