There are many different "cutaneous leishmaniasis" caused by
Leishmania. In some diseases the amastigotes do not spread beyond the
site of thevector's bite. This results in a leishmaniasis (oriental
sore, Jericho boil, Aleppo boil, or Dehli boil) that often heals
spontaneously (view geographic distribution).

In other instances the amastigotes may spread to the visceral organs
(liver, spleen), resulting in "visceral leishmaniasis" (kala-azar or
Dum-Dum fever) (view geographic distribution) or to the mucous
membranes of the mouth and nose, resulting in "mucocutaneous
leishmaniasis" (espundia or uta). Left untreated, these latter
diseases result in high rates of mortality.

To see photos of these parasite and a vector (a sand fly- go to
http://www.biosci.ohio-state.edu/~parasite/leishmania.html