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Difficulty: EasyInfectious Diseases

An otherwise healthy 42-year-old male is evaluated in the ambulatory care center due to a painful swelling on his right thigh. The lesion has been progressively enlarging over the past three days. He takes no medications and has no significant past medical history. Vital signs demonstrate a temperature of 37.1°C (98.8°F), blood pressure of 122/78 mm Hg, and a heart rate of 74/min. Physical examination of the right anterior thigh reveals a 3-cm, highly tender, fluctuant, erythematous nodule with a central purulent punctum. There is no significant surrounding induration, and no regional lymphadenopathy is appreciated. Which of the following is the most appropriate next step in management?

  1. Incision and drainage onlyAnswer
  2. B
    Incision and drainage followed by oral clindamycin
  3. C
    Incision and drainage followed by intravenous vancomycin
  4. D
    Oral dicloxacillin monotherapy
  5. E
    Topical mupirocin application

Answer

Incision and drainage only
The correct approach is incision and drainage only. The patient presents with a simple, uncomplicated cutaneous abscess, characterized by a fluctuant, tender nodule with a purulent center. In an otherwise healthy, immunocompetent patient with a single small abscess (typically <5 cm), no systemic signs of infection (such as fever or tachycardia), and minimal surrounding cellulitis, the definitive treatment is mechanical source control. Incision and drainage alone provides excellent cure rates. Systemic antibiotics are not indicated in this scenario.

Step-by-Step Solution

1
Evaluate the clinical presentation to determine the type and severity of the infection.
The patient has a localized, 3-cm fluctuant mass with a purulent punctum and normal vital signs, indicating a simple, uncomplicated cutaneous abscess.
Categorizing the infection is necessary to determine if both source control and systemic antibiotics are required.
2
Apply current treatment guidelines for an uncomplicated cutaneous abscess.
The standard of care for a single, small abscess in an immunocompetent patient without systemic symptoms is mechanical drainage.
Source control is the most critical intervention for purulent collections.
3
Determine if adjunctive antibiotics are indicated.
Adjunctive antibiotics are unnecessary as the patient lacks high-risk features (e.g., severe extensive surrounding cellulitis, systemic inflammatory response syndrome, immunocompromise).
Prescribing antibiotics when not indicated violates principles of antimicrobial stewardship.

Key Concept

Management of uncomplicated cutaneous abscesses
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Topics

Infectious Diseases

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