B. Complications and Sequelae
When the small external opening becomes obstructed, the accumulated debris and secretions have no drainage route, creating a perfect, warm, anaerobic environment for bacterial colonization. This leads to the most common complications:
Infection (Preauricular Cellulitis/Abscess): This is the primary clinical concern. The area becomes red, swollen, intensely painful, and warm to the touch. The infection can form an abscess (a localized collection of pus) which may spontaneously rupture and drain, often giving off a foul odor due to the anaerobic bacteria trapped inside.
Cyst Formation: Even without active infection, the chronic accumulation of debris can lead to the formation of a preauricular cyst—a soft, non-tender, fluid-filled sac that gradually enlarges.
Recurrence: The chief challenge in managing the P.A.S. is recurrence. If the entire tract is not completely sterilized and excised, the infection is highly likely to return, sometimes becoming chronic and damaging the surrounding cartilage.
