Having a cold or rhinitis may cause symptoms of yellow water from the nose. Having sinusitis, ruptured sinus cysts, or allergic rhinitis with bacterial infection also has a great impact if frequent nose picking leads to inflammation of the nasal vestibule. It can be treated with antibacterial medication, and local erythromycin ointment can also be applied. If it does not improve and is more serious, you need to go to the ENT department for an examination, usually through CT and blood tests to determine the cause, and then according to the results of the examination, under the guidance of a physician, the correct medication treatment.