Surgical drains are inserted to permit the drainage of excessive serosanguinous fluid and purulent material and to promote healing of underlying tissues.
These drains may be inserted and sutured through the incision line, but they are most commonly inserted through stab wounds a few centimeters away from the incision line so that the incision itself may be kept dry.
Without a drain, some wounds would heal on the surface and trap the discharge inside, and an abscess might form.
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