The common disease of auricular running crust is auricular eczema. It is mainly induced by local allergic reactions in the auricle. Clinically, it is mostly manifested by local itching and yellow water in the auricle, repeated local eczema, which can form crusts, and chronic eczema can lead to thickening of the auricular skin and other related changes. Patients with this disease often have allergies, which may be related to the patient’s exposure to allergens, or eating allergic foods and other triggers. It may also be related to the patient’s exposure to mosquitoes and insect bites, which may induce allergies. For this disease, it is recommended to visit the dermatology and ENT departments. Clinically, it is recommended to check the allergens to see what the patient is allergic to. At the same time, anti-allergic ointment can be used for local application treatment, if necessary, oral antihistamine for systemic symptomatic treatment, clinical attention should also be paid to the possibility of local infection.