What is "cochin china ulcer"

Aden ulcer \A"den ul"cer\ [So named after Aden, a seaport in Southern Arabia, where it occurs.] (Med.) A disease endemic in various parts of tropical Asia, due to a specific micro["o]rganism which produces chronic ulcers on the limbs. It is often fatal. Called also Cochin China ulcer, Persian ulcer, tropical ulcer, etc. [Webster 1913 Suppl.] ||