Hard lumps should be referred to as keloids, and patients with symptoms of keloids after their boils have healed can be treated with topical glucocorticoid injections or topical medications such as imiquimod cream. In most cases, boils heal within a few days after the pus drains from the boil, but scarring may remain, and keloids are one type of scarring. When a patient experiences symptoms of a boil that has healed but has a keloid on the skin area, it can be treated with topical injections of glucocorticoids or topical medications such as imiquimod cream under the direction of a physician, which can inhibit scarring by suppressing excess collagen fibers locally. A boil is an acute bacterial purulent inflammation of a single hair follicle and its surrounding tissues, often caused by Staphylococcus aureus, while scarring is a collective term for post-traumatic changes in the appearance of skin tissues as well as histopathologic changes that are the product of trauma repair, including four types: conventional scarring, hyperplastic scarring, keloid scarring and atrophic scarring. Patients are advised to visit the hospital for treatment under the guidance of a doctor when their boils heal but leave behind keloids.