Why is it necessary to add a drainage strip inside an abscess that has been treated

Abscesses are mainly caused by bacterial or viral infections, and there is a damaged wall after the pus is released from the abscess cavity, which can easily cause recurrence of the abscess if the drain is not placed and the drain is closed directly, and some abscesses are separated and form multiple small chambers, which can easily cause recurrence and require multiple surgeries if the drainage is not complete. Drainage can also prevent infection and help the surgeon to determine the recovery, for example, by the cleanliness of the drainage strip and daily dressing changes after placement of the drainage strip, to determine when the drainage can be removed, which can be done in the first 24 hours after there is little or no drainage.