A red nose can be caused by folliculitis, rosacea, localized irritation and other factors. 1. Folliculitis: When the skin and hair follicles in the nose area are damaged, bacteria can easily enter into the hair follicles, thus triggering folliculitis, which is mainly manifested by the appearance of red papules or pustules on the skin surface, and may be accompanied by itchiness and pain. 2. Rosacea: Rosacea may be related to heredity, neurovascular dysfunction, impaired skin barrier function, immune inflammatory response, etc. It occurs on the cheeks, nose, etc., and manifests itself as redness on the surface of the skin, dilated capillaries, papules and other symptoms. 3. Local stimulation: When the nose is locally stimulated, such as cold, heat or contact with certain allergens, such as cosmetics, pollen, etc., may lead to nose red symptoms. Red nose may also have other causes, it is recommended to go to the hospital in a timely manner to improve the examination, clear cause of the disease to give targeted treatment.