Frequent flakes in the external auditory canal can be caused by eczema, fungal otitis externa, acute otitis externa and so on. 1. Eczema of the external auditory canal: this is a common allergic disease in clinic, people suffering from this disease will form white eczema-like material in the external auditory canal, similar in appearance and shape to dander, accompanied by itching, pain and other symptoms. 2. Fungal otitis externa: this condition is usually associated with fungal infections of the external auditory canal. Fungi will attack the mucous membrane of the external auditory canal and secrete dandruff-like substances, accompanied by ear stuffiness, ear pain, itching, tinnitus and other uncomfortable symptoms. 3. Acute otitis externa: this condition is usually associated with bacterial infection of the external auditory canal, which will cause acute congestion, redness and swelling of the mucous membrane of the external auditory canal, and inflammatory secretions and flakes will appear in the ear canal. If the symptoms persist, it is recommended to go to the hospital for a clear diagnosis and targeted treatment.