The sudden swelling of a bag in the ear is a hint that it could be a pseudocyst of the auricle, also called auricular plasmacytochondritis. This disease occurs in people between 30 and 50 years of age, more often in one ear, and this fluid accumulation occurs mostly inside the cartilage, due to cartilage delamination, rather than between the perichondrium and the cartilage. Clinical examination of this disease reveals a limited bulge in the front of the auricle, which is hemispherical in shape and is not painful when pressed, with a fluctuating sensation when pressed. If a puncture is performed, a yellowish cystic fluid can be extracted. However, after a few days, the cystic fluid may reappear after the puncture. Clinically, for auricular pseudocysts, once diagnosed, the best treatment is surgery, which mainly involves removing the cartilage above the auricular chondromyelitis, then suturing the cartilage at the base of the auricle and the skin above, and applying pressure bandages.