Auricular seroma is a cystic swelling with a collection of serous fluid between the perichondrium and cartilage. It is usually in the upper part of the auricle. Seromas can develop spontaneously or after surgery or trauma (primarily blunt trauma) to the ear. An amber or straw-colored fluid is sometimes aspirated.

Auricular seroma is a collection of serous fluid that accumulates between the layers of tissue in the ear, causing a swelling or lump on the auricle or pinna. The thin skin in this region makes it vulnerable to injuries, and trauma, infections, medical procedures, and underlying conditions can contribute to the development of auricular seroma.

A cystic swelling that contains fluid in between the perichondrium and cartilage in the upper part of the auricle is known as auricular seroma. The fluid may be amber or straw-colored. Treatment of these cysts is subject to question as they recur more often after the treatment.