The ulceration of the inner wall of the nostril may be inflammation of the nasal vestibule, sinusitis, injury caused by the nasal mucosa rupture. 1. Nasal vestibulitis: Inflammatory diseases that may cause nasal vestibulitis and ulceration include acute rhinitis, allergic rhinitis, and vasomotor rhinitis, etc. These diseases in the nose are related to the ulceration of the inner wall of the nostrils. 2. Sinusitis: acute and chronic infections of the sinuses will increase the inflammatory secretions, which cannot be removed in time, causing damage to the inner wall of the nostrils and making them prone to ulceration. 3. Excessive nose blowing, nose picking, etc. will appear nasal mucous membrane damage, and even nasal bleeding. In daily life, we should pay strict attention to not be able to pick the nose, nor blow the nose hard, not to rub the nose, to avoid these traumatic factors, if necessary, we should go to the hospital, under the guidance of the doctor to clarify the diagnosis, standardize the treatment, and in the weekdays also need to drink more water, pay attention to a balanced diet.