Leishmania

A 26-year-old female comes to the clinic with a two-week history of painless ulcers on her arms and face. She denies fever, fatigue, or weight loss. She does not take any medications. She has recently returned from a military tour in the Middle East. Physical examination shows ulcers of varying sizes on her arms and face. Some lesions are small, pink plaques with a softened center, while others are larger and covered with a thick white-yellow fibrinous material. The remainder of the physical examination is unremarkable. Complete blood count concentrations are within normal limits. Microscopic examination of a skin ulcer biopsy shows amastigotes inside macrophages. Which of the following is the most likely diagnosis?