Tropical ulcer (also known as "Aden ulcer," "Jungle rot,"
"Malabar ulcer," and "Tropical phagedena") is a lesion occurring in
cutaneous leishmaniasis. It is caused by a variety of
microorganisms, including mycobacteria. It is common in tropical
climates.
I say look for it on Wikipedia and search for it. It's okay if
you barf.