If you have a small bump on the side of your nose, consider folliculitis, common warts, pigmented nevus, keratoacanthoma and so on. 1. Folliculitis: poor hygiene, sweat stimulation, scratching and so on can induce bacterial infection, common bacteria such as Staphylococcus aureus, resulting in inflammation of the hair follicles, may lead to the appearance of red bumps on the side of the nose. 2. common warts: common warts are related to human papilloma virus infection, resulting in the local appearance of pinpoint-sized flat pimples, pimples can increase to the size of green beans, raised on the surface of the skin. 3. Pigmented nevus: pigmented nevus is a benign skin tumor of melanocyte origin. It leads to the appearance of brown, tan, blue-black or black papular-like growths of different colors, sizes and forms. 4. Keratoacanthoma: the pathogenesis of keratoacanthoma has not been fully clarified, and it is considered to be related to heredity, virus, sun exposure and other factors. Skin color, light red papules and nodules may appear on the skin. It is recommended that the side of the nose has a small bump, timely to the hospital for relevant examinations, clear cause of the disease, and then follow the doctor’s instructions for the appropriate treatment.