Peruvian farmer with multiple skin ulcers

An 18 yr old male Peruvian farmer presents to the clinic with multiple lesions on his arms and legs. He denies any water exposure and states that a single lesion erupted on his right arm 3 months ago. Since its onset, multiple other lesions have erupted throughout his right arm and legs as well. He denies any pruritis, or any secretions from the ulcerated lesions. He also has attempted some home remedies including herbals without any relief.
On physical exam, he is afebrile and his vital signs are stable. Skin exam reveals multiple ulcerations and crusts on the posterior side of his right arm, of different sizes. These lesions have well defined borders, with an erythematous base, and no secretions.

What is the most appropriate treatment of this condition?
1. Clarithromycin 500mg twice daily
2. Pentavalent Antimony for 20 days- ANSWER
3. Penicillin G - 2 million units q3hrs IV for 7 days
4. Itraconazole 200mg daily for 3-6 months.