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Difficulty: MediumInfectious Diseases

A 2929-year-old man comes to the outpatient clinic due to a painful swelling on his right thigh. He first noticed a "pimple" in the area 44 days ago, which has progressively enlarged and become increasingly tender. He has no significant past medical history and takes no medications. Vital signs show a temperature of 37.0∘C37.0^\circ\text{C} (98.6∘F98.6^\circ\text{F}), blood pressure of 122/78122/78 mm Hg, and heart rate of 7676/min. Physical examination of the anterior right thigh reveals a 44-cm, erythematous, exquisitely tender, and fluctuant mass. There is a 0.50.5-cm rim of surrounding erythema. No induration extending beyond the erythema is noted, and there is no inguinal lymphadenopathy. Which of the following is the most appropriate next step in management?

  1. Incision and drainage aloneAnswer
  2. B
    Incision and drainage followed by oral trimethoprim-sulfamethoxazole
  3. C
    Incision and drainage followed by oral cephalexin
  4. D
    Oral trimethoprim-sulfamethoxazole alone
  5. E
    Warm compresses and observation

Answer

Incision and drainage alone
The correct answer is incision and drainage alone. The patient presents with a classic cutaneous abscess (a purulent skin and soft tissue infection), characterized by a localized, fluctuant, and erythematous mass. According to standard infectious disease guidelines, a purulent infection is classified as 'mild' if there are no systemic signs of infection (e.g., fever, tachycardia, tachypnea, leukocytosis) and the patient is immunocompetent. For mild purulent infections, mechanical source control via incision and drainage is the definitive and only required treatment. Systemic antimicrobial therapy is not recommended in this scenario, as it does not significantly improve cure rates but does contribute to antimicrobial resistance and potential adverse drug effects.

Step-by-Step Solution

1
Identify the primary clinical finding.
The patient has a 4-cm fluctuant, tender, erythematous mass, which is diagnostic of a cutaneous abscess (purulent skin and soft tissue infection).
Establishing the correct diagnosis determines the treatment algorithm (purulent vs. non-purulent infection).
2
Assess the severity of the infection.
The patient has normal vital signs (temperature 37.0°C, heart rate 76/min), a small rim of erythema, and no comorbidities.
Severity classification (mild, moderate, or severe) dictates whether systemic antibiotics are required in addition to source control.
3
Determine the appropriate intervention based on severity.
Because this is a mild, uncomplicated abscess, source control via incision and drainage is the only required intervention.
According to infectious disease guidelines, adding systemic antibiotics to incision and drainage for mild purulent infections does not significantly improve clinical cure rates but does increase adverse events and antibiotic resistance.

Key Concept

Management of uncomplicated cutaneous abscesses requires incision and drainage alone without systemic antimicrobial therapy.
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Topics

Infectious Diseases

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