What is the recommended treatment for an abscess?

Abscess Treatment

Primary Treatment Approach

Incision and drainage (I&D) is the definitive treatment for abscesses, and for simple superficial abscesses, I&D alone is sufficient without antibiotics. 1, 2, 3

Simple Abscess Management

• Perform I&D as the sole treatment for simple superficial abscesses or boils where induration and erythema are confined to the abscess borders without extension into deeper tissues or multiloculated spread 1, 2, 3

• Do not routinely prescribe antibiotics after I&D for uncomplicated abscesses in immunocompetent patients, as they do not improve healing outcomes 2, 4, 5

• Do not routinely culture simple abscesses, as cultures do not change management in straightforward cases 4, 6

When Antibiotics ARE Indicated

Add antibiotic therapy to I&D in the following specific circumstances 2, 3:

• Severe or extensive disease involving multiple infection sites or rapid progression 2
• Significant surrounding cellulitis extending beyond the abscess borders 1, 2, 3
• Systemic signs of infection including fever, elevated white blood cell count, or sepsis 2, 3
• Immunocompromised patients or those with significant comorbidities (diabetes, immunosuppression) 1, 2, 3
• Incomplete source control where adequate drainage cannot be achieved 1, 3
• Difficult-to-drain locations such as face, hands, or genitalia 2
• Extremes of age (very young or elderly patients) 2
• Associated septic phlebitis 2

Antibiotic Selection for Outpatient Management

For CA-MRSA Coverage (Purulent Cellulitis)

Choose one of the following oral regimens for 5-10 days 2, 3:

• Clindamycin 300-450 mg every 6 hours for severe infections (150-300 mg every 6 hours for less severe) 2, 7
• TMP-SMX (trimethoprim-sulfamethoxazole) - dosing based on weight 2, 3
• Doxycycline or minocycline (tetracyclines) 2, 3
• Linezolid 600 mg twice daily (oral or IV) 2, 3, 8

For Combined Streptococcal and MRSA Coverage

Use clindamycin alone (covers both organisms) OR combine TMP-SMX or tetracycline with a beta-lactam (such as amoxicillin) OR use linezolid alone 2

Complex Abscess Management

Perianal and Perirectal Abscesses

• Perform prompt surgical drainage once diagnosed, as undrained abscesses expand into adjacent spaces and can progress to systemic infection 1, 3

• Drain expeditiously with goals of identifying any fistula tract and either performing primary fistulotomy or placing a draining seton 3

• Use multiple counter incisions for large abscesses rather than a single long incision to prevent delayed wound healing 3

• Add empiric broad-spectrum antibiotics covering Gram-positive, Gram-negative, and anaerobic bacteria 1, 3

• Perform emergent drainage in the presence of sepsis, severe sepsis, septic shock, immunosuppression, diabetes, or diffuse cellulitis 3

• Consider outpatient management only for fit, immunocompetent patients with small perianal abscesses without systemic sepsis signs 3

Intra-Abdominal Abscesses

For diverticular abscesses 9, 3:

• Small abscesses (<4-5 cm): Treat with antibiotics alone for 7 days 3
• Large abscesses: Perform percutaneous drainage combined with IV antibiotics for 4 days 9, 3

For periappendiceal abscesses: Manage with percutaneous image-guided drainage when available; if not available, proceed with surgery 9

Hospitalization Criteria

Admit patients with complicated skin and soft tissue infections including 2, 3:

• Major abscesses requiring IV antibiotics 2
• Deeper soft-tissue infections, surgical/traumatic wound infections 2
• Infected ulcers and burns 2
• Systemic signs of sepsis or severe infection 3

For hospitalized patients with complicated SSTI, use IV vancomycin, linezolid 600 mg IV/PO twice daily, or daptomycin 4 mg/kg IV daily as empiric MRSA coverage 2

Critical Pitfalls to Avoid

• Inadequate drainage leads to recurrence rates as high as 44% - ensure complete evacuation of all loculations 3

• Failure to identify horseshoe-type abscesses or multiloculated collections results in treatment failure 3

• Delayed I&D is associated with higher recurrence rates - drain promptly once diagnosed 3

• Routine wound packing causes more pain without reducing treatment failure or recurrence in most cases (consider only for wounds >5 cm) 4, 5

• Prescribing antibiotics for simple abscesses after adequate I&D provides no benefit and contributes to resistance 4, 5, 6

• Using rifampin as single agent or adjunctive therapy for SSTI is not recommended 2