what is a periarticular cyst
Preauricular sinus and cyst. A preauricular sinus (also known as a congenital auricular fistula, a congenital preauricular fistula, a Geswein hole, an ear pit, or a preauricular cyst) is a common congenital malformation characterized by a nodule, dent or dimple located anywhere adjacent to the external ear.
As a dental student currently studying for a pathology exam, I can tell you that a periapical abscess is not a cyst. By definition, a cyst is a closed sac with a distinct membrane. An abscess, however, is a collection of pus resulting from an inflammatory reaction caused by an infection or foreign body. An abscess does not have a capsule or sac. If you in fact did have a periapical abscess, you likely had a fistula through which it drained. Your body forms a sinus tract via the path of least resistance through which the abscess will drain. Your periapical abscess would pop and drain when the pressure built up.