The best way to prevent this condition is with early treatment for any outer ear infection. This can keep it from spreading. People with diabetes should maintain good control of their blood glucose levels to reduce the risk of infection.
Usually, there are no long-term effects. However, if left untreated or if the person does not respond to therapy, long-term effects may occur. The infection may permanently damage the ear, skull, nearby nerves and blood vessels, and even the brain. Death is possible with severe infections.
This condition generally poses no risk to others.