Red nose refers to rosacea, and erythromycin ointment can cure rosacea. Rosacea is a chronic inflammatory skin disease that occurs in the nose and perinasal area, long-term expansion of local capillaries is the main cause, and follicular worms and recurrent local infections are one of the important factors in the development of the disease. Consumption of spicy food, alcohol, high temperature and cold stimulation, mental tension and emotional excitement, endocrine disorders, etc. can be used as triggering and aggravating factors for this disease. Erythromycin ointment is an antibiotic that can be used in the early stages of rosacea, but it cannot be used as the main treatment drug. In addition to erythromycin ointment, patients need to apply antibiotic drugs such as fusidic acid, doxycycline, minocycline, clindamycin, and other medications such as benzoyl peroxide and isotretinoin under the guidance of a doctor. Usually, the prognosis of the disease is good after standardized treatment. It is important to note that patients with rosacea should go to the hospital in time and be treated with medication under the guidance of a doctor, and should not use medication on their own to avoid delaying their condition.