Treatment of Boils (Furuncles) on the Buttock in Children
Incision and drainage is the primary treatment for boils in children, and antibiotics are typically unnecessary unless the child has fever, rapid heart rate, rapid breathing, or extensive surrounding redness. 1, 2
Primary Treatment Approach
Perform incision and drainage for all large furuncles, which achieves cure rates of 85-90% without antibiotics. 1, 2, 3 For small boils, apply warm, moist compresses several times daily to promote spontaneous drainage, then cover with a dry sterile dressing once drainage occurs. 1, 3
During drainage, thoroughly evacuate all pus and probe the cavity to break up any loculations to prevent recurrence. 1, 3 Culture the abscess fluid during drainage to guide antibiotic therapy if needed later, though treatment without culture is reasonable in typical cases. 1, 2
When to Add Antibiotics After Drainage
Add systemic antibiotics directed against Staphylococcus aureus only if the child has: 1, 2, 3
- Fever >38°C or <36°C
- Rapid breathing >24 breaths per minute
- Rapid heart rate >90 beats per minute
- White blood cell count >12,000 or <400 cells/µL
- Extensive surrounding cellulitis beyond the abscess borders
- Multiple lesions
- Immunocompromising conditions
- Rapid progression or severe disease
The buttock location itself does not automatically require antibiotics if adequate drainage is achieved and the child lacks systemic signs. 1, 2
Best Antibiotic Choice When Indicated
If antibiotics are warranted, amoxicillin-clavulanate 80 mg/kg/day (of the amoxicillin component) divided into 2-3 doses is the first-line choice for children. 4, 5, 6 This provides coverage against both methicillin-susceptible S. aureus (the most common cause) and Streptococcus pyogenes. 1, 4, 5
Alternative Options:
For penicillin allergy or suspected MRSA (if local resistance rates are significant): 1, 2
- Clindamycin 10-20 mg/kg/day divided into 3 doses orally is preferred if local MRSA resistance to clindamycin is <10% 1, 2
- Trimethoprim-sulfamethoxazole (TMP-SMX) 8-12 mg/kg/day (based on trimethoprim) divided into 2 doses - avoid in infants <2 months 1, 7, 2
- First-generation cephalosporins (cephalexin 25 mg/kg/day in 4 divided doses) for non-severe penicillin allergy 1, 7, 5
Avoid doxycycline in children <8 years of age due to tooth staining risk. 7, 2
Treatment Duration
Prescribe 5-10 days of antibiotic therapy if antibiotics are used, adjusting based on clinical response. 2, 8 Most clinical improvement should be evident within 48-72 hours. 8, 9
Critical Pitfalls to Avoid
- Do not prescribe antibiotics without adequate drainage - antibiotics are mostly useless if purulent lesions are not drained. 4, 6
- Do not use oral penicillinase-resistant penicillins alone (like dicloxacillin) as monotherapy in children with buttock boils, as they have poor pharmacodynamic properties and miss streptococcal coverage. 5
- Do not assume MRSA without culture data - in most regions, methicillin-susceptible S. aureus remains predominant in community-acquired infections. 8, 4
- Ensure the incision is adequately sized - inadequate drainage is the most common cause of treatment failure. 2, 3