Swelling and pain in the ear may be a symptom of certain diseases, such as acute otitis externa, boils on the external auditory canal, purulent perichondritis of the auricle, etc., and the cause of the disease should be identified in a timely manner. 1. Acute otitis externa: acute inflammation confined to the skin or subcutaneous tissues of the external ear, mostly caused by bacterial infections, etc. It is mainly characterized by congestion and swelling of the skin of the external auditory canal, oozing and flaking of the surface, pain, etc. In severe cases, hearing loss may even occur. 2. External auditory canal boil: limited purulent inflammation of the skin of the external auditory canal. It manifests as a red, swollen, hot and painful nodule, which gradually enlarges, with a yellowish-white pus head coming out from the top, and exudes sticky pus after it breaks. 3. Auricular suppurative chondritis: mostly caused by trauma, causing acute suppurative inflammation of auricular cartilage membrane. Clinical manifestations of the initial stage for the local burning sensation, redness, swelling and pain, followed by the whole auricle diffuse enlargement, pain aggravation, temperature rise. In the later stages, abscesses may form, and there is a fluctuating sensation when touched. Swelling and pain in the ear, it is recommended that the patient timely consult a doctor to clarify the cause and give targeted treatment.