Excision and draining of abscesses

Role

Incision and drainage remains the definitive treatment for a cutaneous abscess - antibiotics alone are generally inadequate once a discrete fluctuant collection has formed, given the abscess wall's poor antibiotic penetration into the purulent contents
One of the most common minor surgical procedures performed across primary care and emergency settings, given the frequency of skin/soft tissue abscesses

Once pus has organised into a discrete collection walled off by inflammatory tissue, antibiotics penetrate poorly into the avascular abscess cavity - drainage of the pus is mechanically necessary for resolution, and antibiotics alone (without drainage) frequently fail to resolve an established abscess

Clinical diagnosis (fluctuant, tender, often erythematous swelling); ultrasound can help confirm a fluctuant collection versus surrounding cellulitis/induration when the clinical distinction is unclear, particularly in deeper or less obviously fluctuant lesions

Incision and drainage - adequate incision size, breaking down loculations within the cavity, and (for larger abscesses) packing to keep the cavity open for continued drainage and prevent premature closure over residual infection
Antibiotics are an adjunct, not a substitute for drainage - added for larger abscesses, significant surrounding cellulitis, systemic symptoms, or in immunocompromised patients, but drainage remains the primary, essential intervention regardless of antibiotic use
Send pus for culture, particularly relevant given rising rates of community-acquired MRSA in some populations, to guide antibiotic choice if needed

MRSA (community-acquired), recurrent abscess (consider underlying predisposing factors - diabetes, hidradenitis suppurativa, immunosuppression), cellulitis (the key differential when no discrete fluctuant collection is present)

Antibiotics alone, without drainage, are frequently inadequate for an established fluctuant abscess - this is a fundamental, frequently tested management principle distinguishing abscess management from cellulitis (where antibiotics alone are usually sufficient, since there is no discrete collection to drain)

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