Boil in the nostril is a limited acute purulent inflammation of the hair follicles and sebaceous glands in the nasal vestibule, and the causative organism is usually Staphylococcus aureus. This disease is most often caused by factors such as nose picking, nose hair plucking, rhinitis and other factors leading to nasal vestibule skin damage, secondary bacterial infection. Nasal boils may also occur when the body’s immunity is low, such as diabetes, chemotherapy people. The clinical manifestation is localized redness, swelling, heat and pain, and limited elevation. In about 1 week, the boil matures with a yellowish-white pus spot at the top, which may burst on its own to discharge a pus plug. The principles of treatment are: no squeezing, infection control, and prevention of complications. If the boil is immature, antibiotic ointment can be applied, such as mupirocin ointment. If the boil is mature, it can be punctured on its own or the pus head can be punctured with a small probe under aseptic operation, the area is cleaned after rupture, and antibiotic ointment can be applied to the wound, e.g. polymyxin B ointment. If you have boils inside your nostrils, do not use medication on your own. You need to seek medical attention from a medical professional to avoid serious complications such as cavernous sinus infections.