Thank you for your query at AskTheDoctor.com
I understand your concern.
It looks like an abscess which has to be drained as antibiotics are not going to be helpful at this stage.
I will recommend you visit the ER and get it drained as soon as possible.
Meanwhile you will also need an oral antibiotic like Cefotaxime 200 mg twice daily for a week till the swelling completely subsides.
Kindly visit the ER and get it drained.
Hope this was helpful,
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