A painful bump on the inside of the nose may be due to a nasal boil, or a nasal vestibular cyst secondary to an infection. 1. Nasal boil: limited purulent inflammation of the hair follicles, sebaceous glands or sweat glands in the main nasal vestibule, tip and wings of the nose, with the nasal vestibule being the most common. It is common that there is a bulge in one side of the nasal vestibule, and the surrounding infiltration is obvious, accompanied by red, swollen, hot and painful red nodules. 2. Nasal vestibule cyst secondary infection: due to the obstruction of the mucosal gland ducts at the base of the nose, causing retention of glandular secretions, or caused by congenital factors, and then due to other factors leading to infection. There will also be pressure pain, which can be treated with antibiotics such as ampicillin or cefuroxime and cefradine, and surgery can be considered if the cyst is large. Drugs must be applied under the guidance of a doctor. It is recommended to consult the hospital for treatment in time when the above symptoms occur. Because this area is a dangerous triangle, it should be strictly not squeezed to avoid intracranial infection, which can cause serious complications.