Rosacea, also called acne rosacea and red nose, is a chronic inflammatory dermatosis on the nose. Its symptoms include redness of the skin on the external nose, especially on the nose tip. Rosacea mostly occurs among the middle-aged and mostly among women, while for male patients the condition tends to be more serious. The etiology is not determined yet, and possible factors include dysfunction of vasomotor nerve in local areas, demodicosis and repeated infection in local areas, eating spicy foods, alcohol drinking, caloric stimulation, mental stress, agitation, endocrine dysfunction, etc.