A 22-year-old man presents with a 1-week history of a lesion on his index finger that appeared after working at his uncle’s sheep ranch 2 weeks earlier. The lesion originated as a small, firm papule and was accompanied by low-grade fever. Examination now reveals a targetoid lesion on his right index finger and mild axillary lymphadenopathy. Based on this patient’s most likely diagnosis, which of the following treatments should be administered?
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