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Since it didn't work, she should have the infected part cleaned with a surgery. I don't think oral antibiotics will works.
It is called debridement.
Did they culture the clear drainage?
Treatment of adult patients with acute bacterial skin and skin structure infections (ABSSSI) caused by susceptible isolates of the following gram-positive microorganisms: Staphylococcus aureus (including methicillin-susceptible and methicillin-resistant isolates); Streptococcus pyogenes; Streptococcus agalactiae; Streptococcus dysgalactiae, Streptococcus anginosus group (including S. anginosus, S. intermedius, S. constellatus); and Enterococcus faecalis (vancomycin-susceptible isolates only)
fever? how was her recent blood test about the inflammation such as CRP, white blood cells?
Do you have the results from that culture they did with the swab?