Patients with recent nasal stools have the following reasons: 1. Inflammatory factors: there may be a certain degree of inflammatory and infectious disease factors in the nasal cavity and sinuses. The mucous membrane glands of the nasal cavity and sinuses can produce mucopurulent inflammatory secretions due to inflammatory pathogenic factors, which can easily accumulate in the nasal passages and even further form inflammatory dry crusts that adhere to the surface of the nasal mucosa, forming nasal stool-like secretions. 2. Environmental stimulation: Some patients may also be exposed to air pollution in the near future, resulting in the stimulation of the nasal mucosa and secretion of more inflammatory 3. Skin inflammation: Some patients may also have skin inflammation in the nasal vestibule area, or even eczema, which can lead to dry crusty boogers.