Incision and Drainage for Abscesses

Definition and Standard of Care

An abscess is by definition an infected collection of pus that requires drainage as the primary treatment, according to the World Journal of Emergency Surgery 1
For simple superficial abscesses or boils, incision and drainage is the primary treatment, and antibiotics are not needed, as stated by the World Journal of Emergency Surgery 3
To be considered a simple abscess, induration and erythema should be limited only to a defined area of the abscess and should not extend beyond its borders, as defined by the World Journal of Emergency Surgery 2

The most important therapy for an infected collection is to open the incision, evacuate the infected material, and continue dressing changes until the wound heals by secondary intention, as recommended by Clinical Infectious Diseases 4
Studies of subcutaneous abscesses found little or no benefit for antibiotics when combined with drainage, according to Clinical Infectious Diseases 4

Antibiotics should be considered as adjunctive therapy only in specific situations, such as when systemic signs of infection are present, in immunocompromised patients, if source control is incomplete, or in cases of abscess with significant cellulitis, as stated by the World Journal of Emergency Surgery and Clinical Infectious Diseases 1, 4, 5
Systemic signs of infection, such as temperature >38.5°C or heart rate >110 beats/minute, may indicate the need for antibiotics, according to Clinical Infectious Diseases 4
Immunocompromised patients may require antibiotics as adjunctive therapy, as recommended by the World Journal of Emergency Surgery 1, 5
Significant cellulitis, defined as erythema extending beyond the wound margins for >5 cm, may also require antibiotics, according to Clinical Infectious Diseases and the World Journal of Emergency Surgery 2, 4

Confirming the diagnosis of an abscess, which is a localized collection of pus that is by definition infected, is crucial, as stated by the World Journal of Emergency Surgery 1
Performing incision and drainage is the definitive treatment that should not be delayed, as recommended by the World Journal of Emergency Surgery 1, 2
Considering antibiotics only if systemic signs of infection are present, the patient is immunocompromised, or significant surrounding cellulitis exists, is essential, according to Clinical Infectious Diseases and the World Journal of Emergency Surgery 1, 2, 4

For complex abscesses, such as perianal, perirectal, or at intravenous drug injection sites, incision and drainage remains the primary treatment, but adjunctive broad-spectrum antibiotics may be needed if systemic signs of infection are present, as stated by the World Journal of Emergency Surgery 1, 6
Complicated skin and subcutaneous abscesses are typically well circumscribed and respond to incision and drainage with adjuvant antibiotic therapy, according to the World Journal of Emergency Surgery 6
Anorectal abscesses should be promptly drained surgically to prevent expansion into adjacent spaces and progression to generalized systemic infection, as recommended by the World Journal of Emergency Surgery 6