The causes of repeated ulceration and crusting in the nose are mainly related to nasal vestibulitis, sinusitis, bad habits and so on. 1. Nasal vestibulitis: patients with diffuse inflammation at the nasal vestibule, nasal vestibular hair shedding, the skin will be congested, swollen, and there will be hyperplasia over time. Inflammation leads to repeated ulceration and crusting. 2. Sinusitis: patients suffering from sinusitis can lead to an increase in nasal secretions, nasal secretions repeatedly stimulate the nasal mucosa, resulting in repeated ulceration of the nose pus and scabs, which can be accompanied by nasal congestion, bleeding and other symptoms. 3. Bad habits: there are long-term repeated nose picking, nose picking habits are easy to nasal cavity repeatedly ulcerated scabs, should avoid nose picking nose picking action, correct habits, pay attention to keep the nasal cavity clean and hygienic. It is recommended to further go to the hospital to identify the cause of the disease, standardized treatment.