A 10-month-old with a non-draining fluctuant abscess after 10 days of amoxicillin for impetigo; what is the next step?

A 10-month-old with a non-draining fluctuant abscess after 10 days of amoxicillin for impetigo; what is the next step?

• A. Incision and drainage of the abscess with culture
• B. Consultation with a pediatric infectious disease specialist
• C. Culture of any superficial open surface wounds
• D. Empiric treatment with clindamycin

Answer: (A)

When a child has a localized, fluctuant collection that isn’t draining, the key step is to open it and let the pus escape. An abscess is a pocket of infection where antibiotics alone can’t reach the center effectively because the purulent material blocks drug penetration. Incision and drainage physically evacuates the pus, relieves pressure, and often leads to rapid improvement. Getting a sample during drainage allows you to culture the organism and tailor antibiotic therapy if needed—especially if MRSA or other resistant bacteria are involved. This is more informative than swabbing superficial surface wounds, which won’t tell you the cause of the deep infection and can pick up colonizers rather than the pathogen. Consulting infectious disease isn’t typically necessary for a straightforward, uncomplicated abscess in a well-appearing infant. Starting an antibiotic like clindamycin before drainage isn’t the priority here, because without drainage the infection may not resolve; antibiotics can be used afterward if there are signs of extensive cellulitis or systemic illness, guided by culture results.

When a child has a localized, fluctuant collection that isn’t draining, the key step is to open it and let the pus escape. An abscess is a pocket of infection where antibiotics alone can’t reach the center effectively because the purulent material blocks drug penetration. Incision and drainage physically evacuates the pus, relieves pressure, and often leads to rapid improvement.

Getting a sample during drainage allows you to culture the organism and tailor antibiotic therapy if needed—especially if MRSA or other resistant bacteria are involved. This is more informative than swabbing superficial surface wounds, which won’t tell you the cause of the deep infection and can pick up colonizers rather than the pathogen.

Consulting infectious disease isn’t typically necessary for a straightforward, uncomplicated abscess in a well-appearing infant. Starting an antibiotic like clindamycin before drainage isn’t the priority here, because without drainage the infection may not resolve; antibiotics can be used afterward if there are signs of extensive cellulitis or systemic illness, guided by culture results.