Final answer:
Otitis externa is an infection of the external ear canal that can cause symptoms like itching, redness, and discomfort. In severe cases, it can lead to complications like facial paralysis and vertigo. Treatment involves topical ear drops and, in more severe cases, CT scans, intravenous antibiotics, and surgery may be needed.
Step-by-step explanation:
Otitis externa is an infection of the external ear canal, commonly known as swimmer's ear, and is typically caused by Pseudomonas aeruginosa. It is characterized by symptoms such as itching, redness, discomfort, and can progress to fever, pain, and swelling. If the infection becomes severe, it can invade the temporal bone, leading to complications such as facial paralysis and vertigo. The treatment for otitis externa usually involves topical ear drops with acetic acid, antibacterials, and/or steroids to reduce inflammation, and sometimes antifungals if fungi are involved. In more severe cases, a CT scan may be needed to assess the extent of the infection, and intravenous antibiotics may be required. Surgery may also be necessary in certain situations. It's important to seek medical attention if you suspect otitis externa to prevent potential complications.