Dry and crusty inside the nose may be caused by drier air, or by nasal vestibulitis or atrophic rhinitis. 1. Dry air: If the air is excessively dry and the amount of water consumed is low, it may cause the mucous membrane of the nasal cavity to dry out, resulting in ulceration of the mucous membrane and bleeding, which will crust over after drying. 2. Nasal vestibulitis: if there is inflammation in the nasal vestibule, there will be exudate with pus-like texture, and after drying, there will be scabs, accompanied by pain and foreign body sensation. 3. Atrophic rhinitis: If atrophic rhinitis is present, there may be atrophy and deformation of the nasal mucosa, and a large number of dry crusts will gather inside the nostrils, accompanied by a bad odor. The appearance of dry crusts in the nose, it is recommended to actively seek medical attention, clear diagnosis, follow the doctor’s instructions for standardized medication and treatment.