Erythromycin ointment should not be applied deep in the nasal cavity. If it is caused by mucosal inflammation and erosion at the capillary network at the front of the nasal septum, it can be applied with erythromycin ointment in appropriate amount. If the nasal cavity is filled after nasal and sinus surgery, the surface of the filling can be coated with erythromycin ointment externally. Because of the presence of cilia on the surface of the nasal mucosa, frequent external application of ointment-type drugs can affect the movement of nasal mucosal cilia. In addition, due to the complex anatomical structure of the nasal cavity and deep inflammation of the nasal cavity, it is impossible to evenly apply erythromycin and other anti-inflammatory ointments to all the nasal mucosa, so the medication for the nasal cavity and sinuses is based on nasal spray, which can spray the medication needed for treatment evenly into the nasal mucosa, thus having a direct and effective effect.