The common causes of nostril erosion in children are commonly as follows: 1, erosion caused by repeated stimulation of the nasal mucosa by a large amount of secretions during rhinitis or sinusitis; 2, nasal eczema: nostril erosion can occur when there is eczema in the nose; 3, nasal viral infection: nasal viral infection can cause nostril erosion; 4, vitamin deficiency coupled with traumatic stimulation such as repeated nose digging. Different treatment is needed for different causes, and it is best to visit a hospital for a clear diagnosis and treatment.