Treatment of Chest Wall Skin Abscess
For a chest wall skin abscess, incision and drainage is the primary treatment, and if antibiotics are needed (based on systemic signs of infection, extensive surrounding cellulitis, or immunocompromise), use vancomycin PLUS either piperacillin-tazobactam or a carbapenem (imipenem/meropenem). 1
When Antibiotics Are Indicated
The decision to add antibiotics to incision and drainage depends on specific clinical features 1:
Systemic inflammatory response syndrome (SIRS) present:
- Temperature >38°C or <36°C
- Tachypnea >24 breaths/minute
- Tachycardia >90 beats/minute
- White blood cell count >12,000 or <4,000 cells/µL
Extensive surrounding cellulitis extending beyond the abscess borders
Immunocompromised patients
Incomplete source control after drainage
Antibiotic Selection Algorithm
For Severe Infections Requiring Two-Drug Therapy:
Vancomycin PLUS piperacillin-tazobactam is the recommended empiric combination 1. This provides:
- MRSA coverage (vancomycin)
- Gram-negative coverage (piperacillin-tazobactam)
- Anaerobic coverage (piperacillin-tazobactam)
Alternative: Vancomycin PLUS imipenem or meropenem 1
Dosing:
- Vancomycin: 15-20 mg/kg every 8-12 hours IV 1
- Piperacillin-tazobactam: 3.375-4.5g every 6-8 hours IV
- Imipenem/Meropenem: 500mg-1g every 6-8 hours IV
Important Clinical Considerations
The chest wall location matters because these abscesses can have unusual microbiology. While most simple skin abscesses are caused by S. aureus (including MRSA), chest wall abscesses may involve 2:
- Gram-negative organisms (Pseudomonas aeruginosa)
- Coagulase-negative staphylococci
- Polymicrobial infections
- Rarely, mycobacterial or fungal pathogens
Common pitfall: Using single-agent therapy for complex chest wall abscesses. The anatomical location and potential for deeper tissue involvement (including pleural space extension as empyema necessitans 3) justifies broader initial coverage with two agents.
Duration and Follow-up
- Treatment duration: 5-7 days minimum, extended if inadequate clinical response 1
- Culture results: Always obtain cultures from drained pus to guide de-escalation 1
- Imaging consideration: If the abscess is deep or response is poor, CT imaging may reveal pleurocutaneous tracts or deeper collections requiring additional intervention 3
For β-lactam allergic patients: Substitute fluoroquinolone (ciprofloxacin or levofloxacin) PLUS metronidazole for the piperacillin-tazobactam component, maintaining vancomycin for MRSA coverage 1.