**Core Concept**
The treatment of postoperative abscesses involves the administration of antibiotics and the drainage of the abscess collection. The choice of treatment depends on the size, location, and severity of the abscess, as well as the patient's overall condition.

**Why the Correct Answer is Right**
The correct treatment of postoperative abscesses often involves a combination of antibiotics and drainage. Antibiotics are used to target the causative microorganisms and prevent further infection, while drainage helps to remove the abscess collection and reduce the risk of complications. In some cases, incision and drainage (I&D) may be necessary to access the abscess and ensure thorough removal of the collection.

**Why Each Wrong Option is Incorrect**
**Option A:** **Incorrect because** antibiotics alone are often insufficient to treat postoperative abscesses, as they may not penetrate the abscess collection effectively.
**Option B:** **Incorrect because** observation or watchful waiting is not a suitable approach for postoperative abscesses, as they can rapidly progress and cause severe complications if left untreated.
**Option C:** **Incorrect because** percutaneous drainage is a valuable option for abscesses, but it may not be suitable for all cases, particularly those with complex anatomy or multiple collections.

**Clinical Pearl / High-Yield Fact**
The key to successful treatment of postoperative abscesses is early recognition and prompt initiation of treatment, as delay can lead to increased morbidity and mortality.

**Correct Answer:** D.