What Causes Abscess behind the Ear?

An abscess behind the ear is a common side effect of an internal infection. This bump filled with pus may vary in size and can present an array of symptoms, dependent upon severity and cause. Most abscesses behind the ear can be treated at home over several days. A large or deeply infected abscess may require medical attention and possible surgical removal.

An abscess develops as the body’s immune system fights an infection caused by a bacterial, viral, or fungal pathogen. Fever, chills, swelling, pain, and skin redness may indicate the growth of the abscess.

There are two types of abscesses. The average type is seen on the skin’s surface, while an internal abscess is more difficult to diagnose.
Source: https://www.doctorshealthpress.com/general-health-articles/abscess-behind-the-ear-causes-symptoms-and-treatments/