There are mainly the following diseases in external auricular swelling and pain: the first one is purulent auricular chondromyelitis, which is mainly caused by Pseudomonas aeruginosa and Staphylococcus aureus and involves the auricular cartilage membrane as well as cartilage, resulting in purulent exudation between the cartilage membrane and cartilage. The early manifestation of this clinical condition is redness, swelling, heat and pain in the auricle. If the lesion continues to develop, the local formation of an abscess can lead to a sense of fluctuation, which can lead to the formation of a large abscess and the involvement of cartilage, resulting in cartilage necrosis and auricular deformity, which will be difficult to recover once it is formed. The second type is eczema infection of the auricle. Early on, itchy ears and yellow water are the main causes, and once there is an infection, local pain can appear. Patients mostly show itching and tingling sensation on the surface of the ear. The third type is auricular surface eczema, which is also a disease formed by bacterial infection, the skin on the surface of the ear and the subcutaneous tissue.