Diseases that may cause yellow water to flow from the external ear canal include external ear canal eczema, otitis externa and otitis media. Treatment should be specific according to the cause. 1. Eczema of the external auditory canal: an allergic inflammation caused by contact allergy. Clinical manifestations are itching in the affected area and yellow water coming out after digging the ear. Treatment can be under the guidance of the doctor to choose anti-allergy drugs such as loratadine. Or localized cleaning with glycerite lotion. 2. Otitis externa: yellow water is inflammatory secretion, in the early stage of the disease, the yellow water is clear, and then gradually become turbid, accompanied by ear stuffiness, ear pain. Treatment can be under the guidance of a doctor using antibiotics, such as penicillin or ceftriaxone sodium. 3. Otitis media: Inflammation occurs in the middle ear or tympanic membrane, producing inflammatory secretions and yellow water, which can lead to perforation of the tympanic membrane in severe cases. Treatment should be under the guidance of a doctor using chloramphenicol or ofloxacin ear drops and other topical drugs, and with penicillin, cefdinir and other antibiotics. Perforated eardrum requires tympanic membrane repair. If there are symptoms of yellow water flowing from the ear, there are other possibilities, you should seek medical attention in time and actively treat under the guidance of the doctor.