What condition involves inflammation of the external auditory canal (EAC)?

The condition that involves inflammation of the external auditory canal (EAC) is otitis externa. This condition, often referred to as "swimmer's ear," is characterized by the inflammation of the outer ear and the ear canal, commonly due to infections from bacteria or fungi, or from irritants such as water, soap, or foreign objects.

In contrast, otosclerosis is a condition affecting the bony structures of the middle ear, leading to hearing loss, but it does not involve the external auditory canal. Otitis media refers to inflammation of the middle ear, usually associated with fluid buildup and infection, but not the outer ear. Eustachian tube dysfunction occurs when the tube that connects the middle ear to the back of the throat becomes blocked or fails to open properly, also unrelated to inflammation of the external auditory canal.

Understanding these distinctions is essential in diagnosing ear-related conditions effectively and applying appropriate treatments.