Since a couple of you asked for progress photos:
(Wednesday evening, above.)
(Friday morning, above.)
You can see how much farther the infection has spread down my arm since I took the first photo on Wednesday. That, along with the throbbing, is what convinced me to stop assuming it would just go away. On a positive note, the redness appears less intense to me this morning, 12 hours into my antibiotic treatment.
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