The Collaborative International Dictionary of English v.0.48:

Aden ulcer \A"den ul"cer\ ([aum]"den [u^]l"s[~e]r or [=a]"den
   [u^]l"s[~e]r). [So named after Aden, a seaport in Southern
   Arabia, where it occurs.] (Med.)
   One of the numerous names of the lesion of Old World
   cutaneous leishmaniasis. Called also Aleppo boil, Aleppo
   button, Aleppo evil, Bagdad boil, Biskra boil, Cochin
   China ulcer, Delhi boil, Jerico boil, Oriental boil,
   Oriental sore, Persian ulcer, tropical ulcer, etc.
   [Webster 1913 Suppl. + AS]

The Collaborative International Dictionary of English v.0.48:

Aleppo boil \A*lep"po boil\, Aleppo button \A*lep"po but"ton\,
   or Aleppo evil \A*lep"po e"vil\ . (Med.)
   Same as Aden ulcer.
   [Webster 1913 Suppl. + AS]

WordNet (r) 3.0 (2006):

Aleppo boil
    n 1: leishmaniasis of the skin; characterized by ulcerative skin
         lesions [syn: cutaneous leishmaniasis, Old World
         leishmaniasis, oriental sore, tropical sore, Delhi
         boil, Aleppo boil]