he refugee crisis is one of the leading problems of the world today. Factors such as political unrest and wars, drought and famine associated with global warming, and overcrowded neighborhoods after the influx of refugees may seriously aggravate this problem (1, 2). According to the United Nations Refugee Committee, there are almost 27 million refugees in the world today; Syria, Venezuela, and Afghanistan are the leading countries of origin for refugees (3). The old, well-known Asian route of refugees starts in eastern India, passes through all of Afghanistan and Iran, and reaches western Anatolia, where they try to pass the border to reach western Europe illegally. Poor travel conditions of refugees and the poverty associated with the endemic infections may aggravate the transmission risk of many infectious diseases to Turkey and Europe, the primary and final destinations of refugees, consecutively. These infections include many life-threatening infectious diseases, such as tuberculosis, measles, malaria, various diarrheal diseases, scabies, and leishmaniasis. Among them, leishmaniasis has become one of the most prominent diseases as both its incidence and pathogenesis have been modified due to various factors, including the refugee crisis (1-3).Leishmaniasis is a vector-borne, neglected parasitic disease caused by a group of flagellated protozoa, the Leishmania species, and transmitted by sandflies (Phlebotomus spp. or Lutzomyia spp.). Endemic in 102 countries today, leishmaniasis has an incidence of more than 1 million cases, and almost three-fourths of them are cutaneous leishmaniasis (CL), which involves only the skin of the patients and requires essential treatment for total recovery. It is endemic in many countries both in the Old and the New World; according to World Health Organization (WHO), almost 90% of all CL cases are reported in Afghanistan, Brazil, Iran, Peru, Saudi Arabia, and Syria, today (1, 4-7). In addition to geography, climate, and sandflies, individual genetic factors may also influence the risk of CL development among individuals (8).